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16mpg 01 4.7. I have a lead foot and was tearin up those r/ts off the line but they got me at top end. now she doesn't like to go fast. just low an slow.
 

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I have a 3.9 and got 12 mpg before tune up and 16 mpg after. I thought I would be getting alot better gas mileage. I tried driving really easy on it and I still got the same gas mileage.
 

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which way to Shangri La?
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506 Posts
avg 16 mpg all around with my 3.9. can get up to 19 mpg cruising 75ish on the interstates. truck weighs in at 4240 lbs, has the v8 tb, 180 thermostat, and superchips 91 performance mods.
 

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i have a brand new 3.9 and get around 16-18 mostly all around, dont do much freeway driving.
 
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