Rick's Free Auto Repair Advice

Posts Tagged: premium gas

Is premium gas better

Is premium gas better for my car? I often see forum members state that they add premium gas to their cars to get “better performance.” Sorry, but adding a higher octane premium gas to an engine that’s designed to run on regular 87-octane, does not give you better performance. The assumption people make is that premium gas has more “power”. NOPE. The difference between premium gas versus regular gas is just about it’s octane rating One of the laws of physics is that you create heat when you compress a … Read More

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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