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i use regular, i logged my gas mileage and have noticed no difference in mpg between the two, the knock sensor assumption is not a valid reason for gasoline grade, im not sure if you noticed the recommend premium gas is on the gas door with a sticker....on the gauge cluster it actuallly states regular gas recommended...something to think about....
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99 i30
07 rx8
02 sv 650 v-twin
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