It's actually a brilliant design. Do the math and see which saves more money for the performance. I'm sure if V6's got better performance while using less gas on 87 octane they would be using them more.
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2008 Mercury Sable Premier
2014 Ford Focus Electric
1997 Mercury Grand Marquis GS
1991 BMW 850i E31 M70 V12
Moved On: 2000 Sable LS Premium Duratec