gasoline
2 Answers
Regarding installing cold air and exhaust...I think that just running premium fuel with out a tuner will only result in your wallet getting lighter. It will likely make no difference in MPG or power. Adding a tuner with a premium fuel tune will result in increased Horse Power. Anytime modifications are made to both intake and exhaust the engine tune should be modified with a tuner to get the most out of your modifications.
Auto_Centric answered 8 years ago
Complete waste of money your engine can NOT utilize premium fuel to an advantage. Compression ratio is the real factor when considering fuel octane. Regards
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