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z71 package also. I've done all the tips and tricks. Bed cover, throttle commander type item ( saw a .5 increase from time to time in eco mode) not hauling heavy stuff, even had the Alcohol ration set to zero. (because i know the e85 gets worse because of alcohol content.) even running reg it...

How does everyone get these 17-20 mpgs? Simple driving i get 14.4 -14.9 is i baby it for a week. HWy on long (two tank) trip i get 16-17 mpg. 5.3 crew cab. went with 265-70/18s ATs with no loss since 265-65/18. ratio 3.42?