Fuel Consumption

[Fizz]

whats the best way to calculate the fuel consumption (L/100km) for a vehicle which doesnt have the trip computer?

i've been told to use this formula: litres filled into tank (ie. 39L) / mileage (ie. 450km) x 100 = 8.6

lol...is this the correct way?

[lglglg]

whats the best way to calculate the fuel consumption (L/100km) for a vehicle which doesnt have the trip computer?

i've been told to use this formula: litres filled into tank (ie. 39L) / mileage (ie. 450km) x 100 = 8.6

lol...is this the correct way?

Well, the computer on my Jazz was recording between 7L to 10L. But I did my own calculation. I pumped up full tank with BP Ultimate on my Jazz and took note of the mileage. Drove happily till yellow signal came up...drove for another 25km with yellow signal on and took my calculations from there. So I have clocked 450km since I last fuel and divide that by 42 litres (full cap for VTI Jazz) and I got my L/KM.