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According to API, premium and regular gas has essentially the same BTU content (111,400 BTU/gal). Premium is needed on high compression engines because of knocking, but "normal" engines won't see any consistent benefit. Some sources say that the BTU content of premium is slightly lower than regular.
Carbon deposits in the engine, usually high mileage city driven engines, can reduce the cylinder volume (increasing compression), causing knock. But that's a pretty poor reason to spend an additional $0.30 per gallon when Sea Foam can take care of that.
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"Jesus didn't bring 'Natty Lite' to the party. He brought the good stuff."
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