Many major gas companies offer a discount on your gas bill, you just have to know what to look for and who to talk to.
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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