Q. On a recent road trip to South Carolina, we came upon many different places to get gas. On a few occasions we stopped at Sheetz for gas. My question is about the different octane choices at the pump. My Subaru uses 87 octane, but there was 88 octane that was available and was at least 10 cents cheaper, yes cheaper, than 87 octane. I was a little hesitant to try the higher octane, not knowing if it was okay to use. Any thoughts on being able to use this fuel in my Subaru?

A. The 88-octane gasoline sold at Sheetz is 15 percent ethanol rather than the 10 percent ethanol that is in most gasoline. Most cars made since 2001 can use E15 gasoline without any issues. Subaru models vary a bit. In most models you can use reformulated gasoline with up to 15 percent ethanol, but with the 2.5-lite

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