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how many mpg?
In the absence of a maths board I am seeking feedback from any of the MSE'ers who can count. In the spirit of this board the question is in relation to fuel economy.
My car doesn't have a button that tells you the mpg when you are driving so I have filled it up from when the red light came on and checked the mileage when the light came on again. I had to do a refuel mid-count due to a long journey but the figures I have are:
65 litres of petrol did 450 miles.
I am trying to work out the mpg and how much each mile I travel costs me but am struggling with the maths side of it.
I worked out that 65 litres is 14.2 gallons and 14.2 gallons divided by 450 miles is 31.6mpg.
How do I then work out how much in pence (or pounds) each mile costs me?
I am hoping this will give me an MSE jolt to leave the car at home more often but I can't work out how to get the answer.
Each litre of fuel cost £1.18 but I can't work out what to times or divide that by - OMG I can be so dense sometimes.
My car doesn't have a button that tells you the mpg when you are driving so I have filled it up from when the red light came on and checked the mileage when the light came on again. I had to do a refuel mid-count due to a long journey but the figures I have are:
65 litres of petrol did 450 miles.
I am trying to work out the mpg and how much each mile I travel costs me but am struggling with the maths side of it.
I worked out that 65 litres is 14.2 gallons and 14.2 gallons divided by 450 miles is 31.6mpg.
How do I then work out how much in pence (or pounds) each mile costs me?
I am hoping this will give me an MSE jolt to leave the car at home more often but I can't work out how to get the answer.
Each litre of fuel cost £1.18 but I can't work out what to times or divide that by - OMG I can be so dense sometimes.
If you always do what you have always done, you will always get what you always got!
0
Comments
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65L cost you £76.70
so thats 17p per mile
isnt it?
however to work out true MPG
you need to brim the tank
drive X miles
then rebrom the tank
then work out how much it took to fill the tank
the dash MPG isnt that accurate anyway0 -
how did you work out that it cost 17ppm?
I will do it the way you suggested and see if it differs. Thanks.If you always do what you have always done, you will always get what you always got!0 -
gotcha, I think I have been confusing myself with the mpg aspect. That really has nothing to do with the cost per mile which should have been looked at in isolation. Thanks custardy.If you always do what you have always done, you will always get what you always got!0
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You could have done 4.546 (litres in a gallon) times 1.18
so £5.36 a gallon divide by 31.6 which gives the same answer, and I only do imperial before anyone tells me that's the long way of doing it.0 -
Fuel used in litres, divide that by 4.54 to conver to gallons.
Miles travelled divided by fuel used in gallons gives mpg.
Cost per mile is:
Cost for tank is litres used multiplied by cost per litres.
Cost per mile is cost to fill divided by the miles travelled.
Alternatively, if you know the mpg, cost per mile is
cost per litre x 4.54 / mpgHappy chappy0
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