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maths help please

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muddyjames:
I need to work out how many pence a mile my ranger does. I know it does 28mpg. How can I work this out to pence per mile and fuel at 122.9ppl? I did 123 miles so need to work out the cost of that trip.

dxmedia:

--- Quote from: muddyjames on April 19, 2010, 12:11:44 ---I need to work out how many pence a mile my ranger does. I know it does 28mpg. How can I work this out to pence per mile and fuel at 122.9ppl? I did 123 miles so need to work out the cost of that trip.

--- End quote ---

123 miles divided by 28mpg = 4.392857143 gallons used for trip.

4.54L to a gallon, so

4.392857143 x 4.54 = 19.943571429 liters of fuel used

At 122.9ppl it's 1.229 pounds per liter

1.229 x 19.943571429 = 24.510649286


Or £24.51

muddyjames:
thanks very much. I could have used many batteries in my calculator working that out and never got that right answer. cheers. :-)

hairyasswelder:
Different way round.....

1.229 x 4.55 = £5.59 per gallon

£5.59 / 28 mpg = £0.20p per mile

£0.20p x 123 = £24.60

All obviously rounded off but you can use the 20p / mile for each journey if the price of fuel is constant  ;)

Steve

V8MoneyPit:
If you are charging it as expenses, you should add a fair chunk on top of the fuel cost. The tax people have specific rates per mile that include wear and tear. IIRC, based on engine size, a 3.5 V8 can be charged at nearer 50p a mile.

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