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Old 03-12-2011, 10:03 PM
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Blazin72 Blazin72 is offline
You got a leaky spark tube...
 
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We averaged 15.5 with a 99 F-350 dualie with a 7.3 Powerstroke and 6 speed manual. As an uneducated guess I'd say the idi would be somewhere in that ballpark (maybe 14?). I'm not convinced that people with newer full sized turbo-diesel pickups are averaging 20+ mpg, let alone those that claim 25...
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