Cars How to calculate fuel consumption

[ltcars]

The formula for fuel consumption is
(rpm*gas*CONSUMPTION)/1000 litres

My car consumes 6,4 litres per 100km. It revs to 6400. What should I do?

 

[mclarenf1papa]

Drive it for 20 km and see how much fuel it uses, then multiply your CONSUMPTION value by: 6.4/5/fuelUsed.

There's no other effective way unless it's a car racing in a series with regulated fuel flow (e.g. F1 or LMP1).

 

[ltcars]

Drive it for 20 km and see how much fuel it uses, then multiply your CONSUMPTION value by: 6.4/5/fuelUsed.

There's no other effective way unless it's a car racing in a series with regulated fuel flow (e.g. F1 or LMP1).

20 miles flatout in a straight line or on a circuit?

 

[Stereo]

At the speed the fuel consumption test was done (90km/h if it's EPA "highway") on anything long enough to go 20km at that speed.

 

[After_Midnight]

20 miles flatout in a straight line or on a circuit?

I've done it for the Seat at Nords. But I know the real consumption of the car at this track
Also 20 km are not the same like 20 miles