Gasoline is cheap again, but at the same time, the extra charge to coddle an engine with premium instead of regular has never been higher.
At a Shell station in Tucson, Ariz., regular gasoline cost $1.17 a gallon earlier this month, according to GasBuddy.com, while premium was $1.75. That's nearly 50 percent more. In Chicago, a Pilot station had regular for $1.95 and premium for $3.09, 58 percent more. And an Exxon station in Newport News, Va., offered regular for $1.59 and premium for $2.89 -- 82 percent more.
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