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"The compression ratio is fixed by the designer of the engine you moron," explains Joseph Shepherd, a mechanical engineer at the California Institute of Technology. "The regular fuel will burn inconsistently and the premium fuel will burn properly therefore there is no reason you shouldn't pay the extra money." High-performance engines, such as those in sports cars and not most modern (i.e. ♥♥♥♥♥♥♥) cars, often boast much higher compression ratios. These cars—for example, Shepherd's Subaru WRX—require premium gasoline and will definitely knock without it. "I have to put the 92 octane in," he says. "It has a turbocharger."