i have a diesel car and topped up with exactly 11 litres last week and by the time my light came on indicating to top up i had done 209 miles. what is the easiest ways of working miles per gallon out?
2006-10-18 04:26:10 · 10 answers · asked by KT 1 in Science & Mathematics ➔ Mathematics
209 miles / 11 liters
(209 miles) / (11 liters) = 71.9228242 miles per gallon
2006-10-18 04:29:24 · answer #1 · answered by DanE 7 · 0⤊ 0⤋
1 litre = 1.76 pints
1 litre = 1.76/8 UK imperial gallons = 0.22 gal
11 litres = 0.22 x 11 = 2.42 gal
car did 209 miles using 2.42 gal
car did 209/2.42 miles per gallon = 86. 36 mpg or 86 mpg to nearest mile.
That's pretty good. Are you sure your light was on the first time you filled up. If not you had some diesel in the tank and this would be an over estimate. Take another 5 or 10 measurements over a period of time to get an average.
2006-10-18 11:41:27 · answer #2 · answered by RATTY 7 · 0⤊ 0⤋
Fill the tank again to work out how much diesel you've used (it may not be on the same level as last time!) and divide 209 by the numer of litres - this will give you your usage in miles per litre, If you want it in miles per gallon, change the numer of litres to gallons by dividing by 1.74 (to give pints), then by 8 - but you're living in the past!
2006-10-19 09:47:27 · answer #3 · answered by rowanflower 2 · 0⤊ 0⤋
Multiply the number of litres by 0.22, to find the number of Gallons, and then divide 209 by that number.
Can I ask what car can only use 11 litres before the light comes on??? Thats a tiny fuel tank!
I ask this because I'm doubting you are doing this right and your fuel used figure is miscalculated!
2006-10-18 11:31:41 · answer #4 · answered by 'Dr Greene' 7 · 1⤊ 0⤋
A more accurate way is to fill the tank entirely (ie so the fuel comes into view in the filler pipe) then drive for "x" amount of miles, then refill to the exact same level.
How much fuel did you then have to put in? (e.g. 5 litres - which is 1 gallon)
How many miles was "x"? (e.g. 40miles)
So it would be 40 / 1 = 40mpg
2006-10-18 11:33:19 · answer #5 · answered by Wattsie 3 · 0⤊ 0⤋
What you want to do is start with a full tank and mark down your current odometer reading (or set your trip odometer).
Now drive, just like you normally do.
Next when you fill up your tank again, record your distance traveled and the amount of fuel that you take to completely fill your tank.
Now divide the distance driven by the fuel amount.
This will give you your miles per gallon, or miles per liter, or kilometers per liter, etc. Of course the exact unit of fuel economy will be dependent on the units of measure. You can then convert.
To change kilometers to miles, you multiply your kilometers per whatever by 0.62
To change the liters to gallons (US) multiply your answer by 3.79
To change the liters to gallons (IMP) multiply your answer by 4.55
2006-10-18 11:45:20 · answer #6 · answered by math_prof 5 · 0⤊ 0⤋
209 devide by 11 gallons
2006-10-18 11:27:58 · answer #7 · answered by Quintus T 3 · 0⤊ 1⤋
fill up you car; keep a record of the mileage; when you fill up again divide the number of miles by the number of gallons it took you to fill up = mpg; it's important that you start with a full tank and fill up all the way the second time
2006-10-18 11:36:21 · answer #8 · answered by Anonymous · 0⤊ 0⤋
okay, wait till the car is empty and fill it up completely
mark down the number of gallons (or liters) put in
then, drive the car as usual and, at your next fill-up, see how many miles you went between that first one and this one
divide the number of miles by the number of gallons (liters) and you have it!
2006-10-18 11:36:45 · answer #9 · answered by Anonymous · 0⤊ 1⤋
19 ROUGHLY DONT RUN YA CAR TO THE RED LIGHT ITS NOT GOOD FOR IT
2006-10-18 11:29:30 · answer #10 · answered by hineycone1987 2 · 0⤊ 1⤋