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I just recently purchased a Subaru Impreza RS. The question is which is the best type to use? Do I use just 87 octane regular or does it require premium gas? Thank you
The higher the octane rating the harder it is for the fuel to ignite and burn.
Unless your engine has a very high compression rating or you have forced induction in either a super charger or turbo charger system, you don't need, nor is it worth your while to pay for a higher octane fuel, when if anything it could do more harm than good. Incomplete combustion is not good for the longivity of your engine.
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