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I was just saying this because at 150kmh there is no way your car will do 5.7 l/100km, even taking into consideration the car is not actually going at 150.

See the chart for the actual fuel...

150 kmh? it must have been at a pretty high RPM at that speed. Since your computer is giving 5.6, I am guessing it was around 6.4 actual. The only way to know for sure is to track it with a proper...