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Old 02-11-2008, 05:41 PM   #4
There Is No Substitute.
 
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Join Date: May 2007
Location: West Coast
Posts: 3,253
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It depends on your city/highway ratio, driving style, and things like air flow (dirty or clean radiators?).
I have a '99 2.5L and I normally use 91 octane.
My average is about 20-21mpg 80 city / 20 highway. But when it is 50/50 I get about 25mpg. And on road trips 100% highway I have gotten up to 29-32mpg.
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