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Author Topic: Imperial MPG converted to US MPG Post a Reply Back to Topics
gearmax

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New Brunswick

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Message Posted: Nov 22, 2010 8:35:06 PM

ANyone have a formula to convert Imperial Gallon to US Gallon and Miles per gallon for example

1 US Gallon = 0.8326742 Imperial Gallon

So if your car does 36 MPG's in Imperial, how many US Gallons MPG's would be equivalent. Any quick formula
REPLIES (newest first)
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MIT05
Champion Author Massachusetts

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Message Posted: May 7, 2012 7:35:22 AM

Add 20% more
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red_green17
Champion Author Ottawa

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Message Posted: May 7, 2012 6:57:32 AM

Interesting to note!
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GallonGuy
Veteran Author Cleveland

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Message Posted: Oct 28, 2011 7:27:42 PM

Easiest would be to divide by 1.201 (1.2 is close enough) to convert Mi./Imp. Gal to Mi./U.S. Gal.Just to clarify, the imperial gallon is NOT exactly one quart more. It is a 160 Imp. fl. oz. measure, based on the weight of 10 lbs. avdp. of water at a certain temperature in degrees Fahrenheit, I think 60. Fahr. (15.5Cels.)

The U.S. Gallon is based on VOLUME, 231 cu. in., the Queen Anne Wine Gallon used in Britain until 1824, when the Imperial Gallon was introduced, is still used here and in several other countries for dispensation of fuel. Several countries in Central America, the Carribean, and Asia use our measure.

Several other commonwealth countries continue to use Imperial Gallons. United Arab Emirates used the measure for fuel until 2010. So anyway, the US gallon is 128 fl. oz (8*16 oz. pints) but our fluid ounce is slightly larger (it isn't the actual exact weight of an ounce of pure water at 60°, not sure why it differs) So you can't just multiply by 160 and divide by 128, or vice versa. The imperial fluid ounce is roughly 96% the size of a U.S. fluid ounce.

The imperial pint is 20 fl. oz and the quart is 40, hence a 160 fl. oz. (10 lb.) gallon/ 1 oz. of water weight of a fluid ounce. U.S. again being size based at 231 cu. in. not weight based, is roughly 8-1/3 lb., but not exactly that weight.

Anyway, nothing wrong with using gallons, but it's best to specify which kind at all times to avoid confusion [U.S./Imp]. There's also dry measure (pecks, bushels, quarts [gallons] that are larger, almost the size of imperial measures. That is all an ugly mess though. They are an ugly number of cubic inches, liters, and liquid/imperial measures.

Farmers supposedly have a "bushel" that is actually weigh-based anymore anyway.

[Edited by: GallonGuy at 10/28/2011 8:30:43 PM EST]
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HOGYLD
Champion Author Vancouver

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Message Posted: Oct 2, 2011 4:10:03 AM

One Imperial gallon is 4.546 liters.

One US gallon is 3.785 liters.

Imperial measure hasn't been used in Canada since the 70's or anywhere else in N. America that I'm aware of so it's kind of a moot point.
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rumbleseat
Champion Author Winnipeg

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Message Posted: Oct 1, 2011 12:39:44 AM

I have no idea where the idea for litres/100 kilometres originally came from, but since metric conversion, I have always calculated mine as km/litre. Litres/100 kilometres is a strict consumption measure. For those that are used to mpg as a mileage figure, km/litre would seem to be easier to understand.
When shopping for cars, litres/100 kilometres gives a comparison, the higher the figure, the lower the "mileage" when comparing one vehicle to another.
The only time I do an mpg calculation based on Imperial gallons, which haven't been pumped in Canada for a good many years, is to give a comparison figure to an stubborn oldster, usually somebody well past 80, who hasn't tried to figure out metric.

[Edited by: rumbleseat at 10/1/2011 1:45:39 AM EST]
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Maintroll
Champion Author Lexington

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Message Posted: Sep 30, 2011 11:08:00 PM

The Imperial gallon is approximately one quart more per US gallon, so every time you get four Imperial gallons it is actually five US gallons.
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kslgas
Champion Author Calgary

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Message Posted: Sep 30, 2011 9:03:34 PM

I'm from the old school. I'm comfortable with imperial. All these years, just lately I start relate with 3cm. ~ 1 in., 1 m. ~ 1 yd., 1 kg ~ 2 lb. This take a long time.

As for litre/gallon, is 1 to 3.8, 1 litre don't travel far. l/100 km looks better. This is my explanation. I may be totally wrong.

Measuring fuel economy- KMPL VS Liters/100 kms - Which is better?
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jscdig
Champion Author Maine

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Message Posted: Sep 30, 2011 5:29:06 PM

Regarding metric, I get some of it, primarily liters and kilometers. I find that relatively easy. Where I get messed up is mm, cm and dm and converting between them. Why are rain and snow measured in cm? I would think it would be easier to say it's .something meters. I suppose it's the same as inches, feet and yards in principal, but I still can't compute the differences in metric. And why is the measurement for "mileage" (which it really isn't in metric) done in liters per 100 kms? If it's miles per gallon, why isn't it liters per kilometer?
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kslgas
Champion Author Calgary

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Message Posted: Sep 30, 2011 3:49:56 PM

thank you

then it is miles per US gallon
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gvan
Champion Author Chicago

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Message Posted: Sep 30, 2011 2:53:18 PM

For future reference: On the HOME PAGE scroll down and look in the left column for RELATED INFORMATION. There is a Volume Converter Tool.

US Gallons: Canadian Gallons: Liters:

Calculation Values Used:
1 U.S. Gallon = 0.83267 Canadian (Imperial) Gallons
1 Can Gallon = 1.201 U.S. Gallons
1 U.S. Gallon = 3.785 Liters
1 Can Gallon = 4.546 Liters

[Edited by: gvan at 9/30/2011 3:53:51 PM EST]
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gvan
Champion Author Chicago

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Message Posted: Sep 30, 2011 2:48:04 PM

"In the gas logbook, for mpg, is US or Imperial?"

It depends where you are from......U.S. or Canada. My fuel logbook shows gallons because I live in the Chicago area. However, I just signed into CalgaryGasPrices and opened my Fuel Logbook and my gallons had been converted to litres.
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diesdown
Champion Author North Carolina

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Message Posted: Sep 29, 2011 3:03:52 PM

You listed the basic formula, apply a little algebra.

36 Imp Gall = 43.2 US gal

36 divided by .8326742 = 34.2
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kslgas
Champion Author Calgary

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Message Posted: Sep 29, 2011 2:02:42 PM

In the gas logbook, for mpg, is US or Imperial?
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dieselb100
Champion Author Massachusetts

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Message Posted: Nov 28, 2010 4:36:55 AM

Its all about what you're familiar with. I grew up in the metric system so metric is easy. But most of my life has been in the US system. So I know both. But just because I'm very familiar with the metric system's conversions I have a difficult time judging distances, weights, lengths in metric than I do in the English system.
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gearmax
Rookie Author New Brunswick

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Message Posted: Nov 27, 2010 1:55:34 PM

I like the humor, I have no problem with metric it's easy
10mm = 1cm
10cm = 1dc
10dc = 1m
1000m = 1km
1000km = 10,000km just wanted to see if you pay attentions

1000 ml = 1 litre

When I look at a 8ft board I know what it looks like when if you were to tell me that the room is 2438.4mm wide, I have a problem with that.
Same as a mile or km

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dieselb100
Champion Author Massachusetts

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Message Posted: Nov 26, 2010 11:14:26 PM

A few more conversions under your belt and it will be second nature.
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herbiepopnecker
Champion Author British Columbia

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Message Posted: Nov 26, 2010 11:04:56 PM

Yes 35 years should be enough time to learn metric.
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PnnyPnchr
Champion Author Toronto

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Message Posted: Nov 26, 2010 9:26:07 PM

It took me years, but I finally got used to the metric L/100Km units. Imperial gallons? Those haven't been around for 35 years. Time to get with the program!
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gearmax
Rookie Author New Brunswick

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Message Posted: Nov 26, 2010 11:29:14 AM

dieselb100 yes this car is excellent on fuel economy, I even had the sales rep from Chrysler sitting in the car with me and he could not beleive what I am getting. I really trying not to advertise here but if you want more info since you asked you can read up on it at

Maintroll yes the car still gets the same just different quantities due to the amount difference in gallons. Here in Canada they changed over to the metric system many years ago, but my education already had done me in with the imperial system so it has been hard to convert to metric for me.

Metric is easy to work with dont get me wrong
take 1000mm to make 1 meter and 1000 meters to make a kilomerter
or 1000ml to make 1 litre


[Edited by: gearmax at 11/26/2010 12:31:45 PM EST]
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dieselb100
Champion Author Massachusetts

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Message Posted: Nov 26, 2010 8:31:56 AM

I saw the video. So what you're saying is that with the additive (MoreMPG), which I have no idea what it is about, you're getting about 7MPG (US) more than without. My diesel is rated 27/37 but I do get more like 22/41 in actual measured mileage. So I suppose it is possible that you're getting 29MPG (US) for a vehicle that is rated at 22MPG (US).
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Maintroll
Champion Author Lexington

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Message Posted: Nov 26, 2010 7:25:35 AM

The car still gets the same milage no matter how you figure it. It just comes up one figure for the American gallon and another figure for the Imperial gallon. I thought you people up thar in the north used the metric system of liters now.
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gearmax
Rookie Author New Brunswick

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Message Posted: Nov 25, 2010 7:53:45 PM

But my car and scanguage is set to imperial gallons and get an average of 36 mpg which is 29.97MPG (US).

This has been verified over and over calculating the amount of km and the amount of litres and has been accurat to the Scanguage. See this is my 300 average 29+MPG (US) youtube the following link

youtube dot com/watch?v=MNOithDZt0k

if we want to convert km to miles per gallon, 2.825 x KM / Litres = MPG Imperial.

[Edited by: gearmax at 11/25/2010 9:00:55 PM EST]
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dieselb100
Champion Author Massachusetts

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Message Posted: Nov 25, 2010 6:46:00 PM

Imperial Gal is more than a US Gal and therefore you should go more miles on one of those. A 2005 Chrysler 300 with 3.5L engine is rated in the US as 15MPG(US) City and 22MPG(US) Highway (15/22). So in imperial MPG it would be 18/26 Imp Gal per Mile.

So if your actual measured is better than what is rated then I would guess that your 29MPG is in Imperial Gallons which would equate to 24MPG US and that is way more likely than 34MPG US.

So for your original post a 36MPG (Imp) would equate to 29.97MPG (US). Remember, you go further on an Imp Gal than you would on a US Gal because an Imp Gal is more than a US Gal by about 1.2x. So when you do the math for MPG conversion you need to divide the correct way.

So car54BC is correct.

[Edited by: dieselb100 at 11/25/2010 7:46:41 PM EST]
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gearmax
Rookie Author New Brunswick

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Message Posted: Nov 25, 2010 6:26:55 PM

Hey we have a winner, Thanks, so if my 2005 Chrysler 300 with 3.5L engine get 29MPG in the USA is that good, because at 36-37 here in Canada it is great, I see people buy little tiny cars to try and get this mileage.
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car54BC
Champion Author British Columbia

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Message Posted: Nov 25, 2010 4:20:50 PM

29.976768 miles per gallon --- Is there a prize ?
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kookiwoogi
Champion Author Indiana

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Message Posted: Nov 25, 2010 1:36:10 PM

The metric system is better because it is based on 10's. I just never had to use it, so it is harder for me to use.
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gearmax
Rookie Author New Brunswick

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Message Posted: Nov 25, 2010 8:02:31 AM

43.2 actually and I had figured that out, but maybe it's the other way around, since the US gallon is smaller, then could it be 28.8 MPG USA

I think the answer is 28.8 Miles per US Gallons.

Now it makes more sense to me why when I say to someone in the USA that my Chrysler 300 get 36 MPG they don't believe it, because I should really be saying 28.2 MPG's in USA Does this make sense.

[Edited by: gearmax at 11/25/2010 9:06:09 AM EST]
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dieselb100
Champion Author Massachusetts

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Message Posted: Nov 25, 2010 4:24:38 AM

gearmax,

The question was answered below by several people. But if you want someone else to do the math then 36MPG imperial is about 42MPG US.
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gearmax
Rookie Author New Brunswick

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Message Posted: Nov 24, 2010 7:31:32 AM

Rumbleseat, just habbit, I never could get used to Liters, MPG's are easier, and everytime I talk with someone in the USA I lose them when I talk KM and Litres.

But still the question is unanswered. Of the car that get 36MPG imperials what would that same car get if it was in the USA, would we still say 36MPG's it would be different numbers wouldn't it.
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MertieMan
Champion Author Lexington

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Message Posted: Nov 24, 2010 5:30:56 AM

An Imperial gallon is exactly one quart more than an American gallon and then for every four gallons Imperial you have five gallons American, now can you figure it?
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rumbleseat
Champion Author Winnipeg

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Message Posted: Nov 24, 2010 2:50:22 AM

"All of Canada should change to the gallon system to be like us down here."

Why would we want to go backward in time to an archaic system of measurement abandoned by most of the world, and, worse yet, to a dinky little gallon 20% smaller than the one we used to use?

gearmax, why are you even thinking Imperial gallons when you purchase fuel in litres?

[Edited by: rumbleseat at 11/24/2010 3:51:33 AM EST]
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scrounger
Champion Author Vancouver

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Message Posted: Nov 23, 2010 11:37:46 PM

Copy the formula from online conversions into a spreadsheet and excel will look after it for you
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dieselb100
Champion Author Massachusetts

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Message Posted: Nov 23, 2010 1:35:07 PM

Do what WEPSMAN suggested or:

1 imp Gal = 1.2009499255 US Gal

So it is about 1.2 for easy math.

For all of your other conversion needs you should try this:

Online Conversions
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PithyOpiner
Champion Author Stockton

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Message Posted: Nov 23, 2010 10:46:46 AM

All of Canada should change to the gallon system to be like us down here.
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bluenvoy
Champion Author Nashville

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Message Posted: Nov 23, 2010 8:41:42 AM

Don't have the Imperial Gallon here. Thought Canada uses Liters?
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WEPSMAN
Champion Author South Dakota

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Message Posted: Nov 23, 2010 7:50:46 AM

divide the Imperial MPG by 0.8326742.

[Edited by: WEPSMAN at 11/23/2010 8:51:30 AM EST]
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