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damn that horrible!!!!! 14-15mpg!!!!! my navigator gets 15.5mpg but @ 7000lb i dont blame it imagine if i did a electric fan converstion i could already get better then the echo boost.....
Did you miss the part where he installed a leveling kit and bigger tires? Those have a huge impact on mileage. Do the same on your Navi and you'd be down to 10-12 mpg.