Rick's Free Auto Repair Advice

Posts Tagged: knock

Gas mileage and octane rating

Gas mileage and octane rating Every once in a while I read a post on an auto forum where someone claims to get better MPG and performance when running a higher octane fuel as if gas mileage and octane rating are related. Or, they claim to get better gas mileage with one brand over another. Different grades of gas contain nearly the same amount of energy (BTUs). The ONLY difference between 87 octane and 93 octane is fuel’s ability to resist detonation and knock due to the heat of compression … Read More


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