"Convert miles to Km and calculate a rule of 3 to see how many Kilometres I would’ve driven with 100km."
I've always struggled with maths, but I don't understand the statement above at all.
FWIW, this is how I calculate fuel consumption:
- Go to fuel pump. Zero the trip odometer.
- Fill the tank to the brim, carefully coaxing in as much fuel as possible until it's about to overflow.
- Drive the car until the tank is pretty low. Go to fuel pump.
- Note the miles covered, record, zero the trip odometer for next time.
- Fill the tank to the brim as before. Note the volume of fuel used, which will be in litres. (It's probably going to be on the receipt anyway.)
- Perform this calculation: multiply the litres of fuel used by .22 to give gallons. Divide the miles covered by the amount of fuel in gallons. The result is your consumption in MPG.
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