Quote:
Originally Posted by M2siast
While on the Autobahn, I was thinking "if I were driving my M2 at 290km/h, how long would I be able to go?"
Thinking I'd probably have to fill up every 200km...
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You won’t get anywhere near 200km to a tank at 290km/h. Typical efficient cruising highway speed at 100 - 120km/h would have the M2 engine running at about 10% of maximum power output depending on accessory parasitic drain, at the 285km/h speed limiter would need about 85% of maximum power. Typical maximum thermal efficiency and consequent lowest specific fuel consumption is at about 75% of maximum power output, 85% would be a little less efficient and 15% power output would be about half the efficiency.
This would lead to about 5 times the fuel consumption compared with the most efficient cruising speed, i.e. 40 litres per 100km instead of 8 l/100km. 120km is the max realistic range at the speed limiter.
Here is a typical ICE thermal efficiency chart that maps well to specific fuel consumption:
