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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van SPONSORED BY:

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Old 12-17-2010, 02:28 PM
groy groy is offline
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Quote:
Originally Posted by jfralph View Post
Change is about 3.75% (265 vs 285 75 16")

Or, @75 mph speedo, actual speed is 77.8 mph
Must by my speedo is off the difference, which makes the MPG worse yet...
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  #47  
Old 12-17-2010, 02:58 PM
High_HP High_HP is offline
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My stock '06 CC 4x4 gets 21mpg highway on the stock tune....i am avoiding the latest flash like the plague, even my dealer confirmed mileage and throttle response is decreased with the newer flash. hth
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Old 12-18-2010, 05:05 AM
ejs05f350 ejs05f350 is offline
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i have a 05 f350 cclb srw w/3.73 grs and stock size cooper atr's @ 65psi.the only mod done soo far was a 4" turbo back exhaust. best mileage with new ficm has been 17.8 highway running cruise @ 75mph, average around town 14-15. also mileage seems to depend on what brand of fuel i fill up with. so far marathon and sunoco have brought me the best economy.
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Old 12-18-2010, 05:05 AM
 
 
 
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