If you fill your tank with premium gasoline, you're spending a lot of extra money at the pump. But is it worth it?
AAA found that vehicles that recommend but don't require premium fuel might see a moderately better performance with higher-octane gasoline.
The high cost of premium, though, may outweigh the benefit.
The price gap between regular and premium gas has jumped from 10 to 25 percent a gallon in the past few years.
Premium gas costs not worth the benefits, experts say
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