John Paul, AAA Northeast's Car Doctor, answers a question from a reader wondering whether they need to follow the ...

How high of an octane does your car actually need to run well? Here's what to know about the consequences of using the wrong ...

Is premium fuel worth the extra cost over regular ... However, if a driver mistakenly puts 87-octane regular in a vehicle that needs 91 or more, the engine-control computer should be able to ...

Whereas 93 octane is the common premium fuel in the Northeast U.S., West coast drivers operate the very same vehicles on 91 (often the highest octane available), with no particular ill effects.

The system features a pair of fuel injectors for each cylinder, one providing 91-octane pump gas for subdued driving and the other for high-octane race gas while under increased boost pressures.

Using premium fuel in your Toyota is a secret method to unlock more power, but the opposite rings true for Lexus vehicles. If ...