I'm gonna go against the majority just because I can and say that your parents should put in 91 or higher octane...reasoning behind this is premium grade gas has better detergents to clean and keep clean the fuel system and engine and since they're paying for the time being might as well cash in on it. As for the affect it'll have on mpg and performance, it may lead to a little loss in both but really doesn't matter how many mpg your getting if your not buying the gas and performance wise you or your parents aren't racing your '96 accord are you?
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