Thread: 6.4L Programmer
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Old 03-17-2008, 11:07 PM
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08SuperDuty
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Originally Posted by SouthTexasDiesel
The 6.4 is a efficient engine by itself, but when paired up the the new exhaust systems the mileage is horrible for most people.
I get 18.5-20+ mpg cruising at 55.
 
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