Quote:
Originally Posted by AndyA6
Our Cayenne S gets horrible mpg and has less power ('08 "S").
The Boxster also runs way below the real available power and mpg isn't that good either....
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If your cars are down on power and have bad MPG's by running 93 octane with 10% ethanol, than you have other issues. Power should not be effected, at all. And MPG's will only be slightly less.....<10% less.