Hey Scotty. What is there real deference between regular gas and supreme gas. I know that octane is the ability of a fuel to resist ignition under compression but why is it that mazdas sky active engine with a compression ratio of 15:1 can run on regular gas but older vw engines with a compression ratio of 10:1 require premium fuel?
Because modern cars are computer run and they can compensate for anything. Old cars could not do that