

Working out how many miles per gallon my car does 

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04032008, 12:51  #1 
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Working out how many miles per gallon my car does
I want to work out how many miles per gallon my car does, but it all feels a bit difficult cos of getting petrol in litres, and my being rubbish at any sort of conversions.
Is there any sort of forumula or online calculator thingy which I could use to help me? Many thanks and apologies for stupid question. Miss P 
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04032008, 12:59  #2 
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Duno but there is 4.54 L in a gallon so I work it out that way.
lets say 6 litres gives me 130 miles 130/6 = 21.66miles per litre 21.66*4.54 =98.33 miles per gallon 
04032008, 13:05  #3 
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duplicate

04032008, 13:06  #4 
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Quote:
6 litres gives me 130 miles
130/6 = 21.66miles per litre 21.66*4.54 =98.33 miles per gallon 
04032008, 13:10  #5 
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Do you have a milometer you can clock on your car? If so, set it to zero, then drive until it's time to fill up again.
Then take the number of miles showing, ie 250 and divide it by the number of litres you have just put into the car ie 30 litres So 250/30 = 8.33. That's the number of miles you get to the litre. To find out per gallon, multiply the 8.33 x 4.54 = 37.83 mpg. 
04032008, 13:18  #6 
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98.33 mpg what do you drive, a lawnmower?

04032008, 13:18  #7 
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98.33 mpg what do you drive, a lawnmower?
A 125cc motorcycle, i'll get 98 if I ride like miss daisy. 
04032008, 13:19  #8 
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this is v good but then I want to work out how much each mile costs me for fuel, how do I do that?
I am stupid with sums, so sorry! Miss P 
04032008, 13:20  #9 
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Wow! I could only dream of that! I'm averaging less than 20 at the moment ;(

04032008, 13:26  #10 
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this is v good but then I want to work out how much each mile costs me for fuel, how do I do that?
I am stupid with sums, so sorry! Miss P i'm getting 21.66mile per litre Petrol near me is £1.03 per litre 1.03 / 21.66 = 0.047 so you could say it costs me 5p per mile if i ride slow. 
04032008, 13:26  #11 
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this is v good but then I want to work out how much each mile costs me for fuel, how do I do that?
I am stupid with sums, so sorry! Miss P Like above zero your mileometer when you fill up. Fill the tank to the brim then drive around a bit and note down the milage you've covered. Then fill the tank to the brim again and note how much you spent. Divide the cost of fuel by the number of miles. For instance. If you do 300 miles and spend 30 quid refilling the tank then you have spent 30/300 = 10p per mile (I wish ) on fuel No need to convert litres into gallons or any of that nonesense if you just want to work out cost per mile. 
04032008, 13:33  #12 
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this is v good but then I want to work out how much each mile costs me for fuel, how do I do that?
I am stupid with sums, so sorry! Miss P I try not to do these kinds of sums, because I never like the answers! 
04032008, 13:34  #13 
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Wait till your petrol warning comes on,
reset the odometer to zero, put 18 litres of petrol in. wait till the petrol warning comes on. read the odometer. the mileage is for 18 litres (4 gallons) of petrol. For instance if you travelled 200 miles, then 200 divided by 4 gives m/gallon. Or 200 divided by 18 gives M/Litre. Take the price you paid for the fuel, ie £20. divide the distance by the price, ie 200miles/£20 gives 10 miles per pound. 
04032008, 14:05  #14 
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04032008, 20:36  #15 
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But I thought fiddling with the odometer thingy was something you weren't meant to do  don't you lose the true mileage if you do that? I thought fiddling with the clock was something dodgy used car salesmen did.
Sorry again to be dim! 
04032008, 20:41  #16 
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this is v good but then I want to work out how much each mile costs me for fuel, how do I do that?
I am stupid with sums, so sorry! Just incase your trying to work it out, to bill someone (ie. an employer) for cost of you using your car, the recommended charge is 40p a mile (average costper mile of running a car, from the AA, with everything taken into consideration) Quote:
Wow! I could only dream of that! I'm averaging less than 20 at the moment ;(
Thing is, I'm imagining your driving either a sports car or a Land Rover.. either way, showoff self inflictedness I get 48mpg (Urban) and it's higher motorway 
04032008, 20:44  #17 
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Google has a conversion facility.
For example, just type in 40 litres in Imperial Gallons and it'll give you the answer. It's necessary to specify Imperial gallons because the US gallon is smaller. Typing 40 litres in UK Gallons also does the job. 
04032008, 20:51  #18 
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But I thought fiddling with the odometer thingy was something you weren't meant to do  don't you lose the true mileage if you do that? I thought fiddling with the clock was something dodgy used car salesmen did.
Sorry again to be dim! 
11052008, 01:49  #19 
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Easy mpg calculator

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