gas mile increase

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IndyHoe

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Joined
Aug 7, 2007
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Location
Indianapolis
I'm getting 12.1 mpg x 21 gal = 254 per tank in my 2007 Z71 (5,000 miles)
And 9.1 mpg x 21 gal = 191 per tank in my 2004 Z71 (63,000 miles).
I run E85 in both, mostly in town driving. Only mods on the '04 is a Gibson cat-back and a AEM Brute Force CAI. Both have 3:73 gears. The '04 runs strong, so I don't think is off tune, resulting in lower mpg's, I think the 07's fuel management system must really work!
 
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