Some cars (like the Fusion with EcoBoost) can run on either, but as it states in the fine print, "the horsepower stated is only achieved with Premium fuel."
The engine is also designed to use both, but to get the performance, Premium should be used.
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mults
40th Anniversary 'Z', 312.06HP/260.58TQ (Dynosty EcuTek Tune)
Build Date/Number: 1/27/2010 #706
Berk HFC + CBE, R2C CAI, Clear Bra, Cleveland Z Club
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