At the bottom of the screen, a calculation of the vehicle´s gas mileage at the current instant is displayed; it ranges from about 7 MPG (when I floored the accelerator from a stop) to 99 MPG (on any flat or downhill road).
This index is essentially the opposite of the octane rating, where a high octane fuel resists spontaneous ignition, and therefore does not tend to ´knock.´ The cetane number of 100 was arbitrarily assigned to ´cetane´ or n-hexadecane, a straight-chain aliphatic chemical compound that burns very well, in the single-cylinder test diesel engine.
Fuel mileage ranged from the Spirit´s 42.5-mpg average to the 35.1-mpg average of the Aero.
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