Question about 2008 Ford F-250 Super Duty

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Bad MPG I just purchased a 2005 F250 FX4 Superduty 6.0L Diesel with an automatic transmission. The truck has 100,000 miles on it and is completely stock. It runs GREAT and has plenty of power! No smoke whatsoever, turbo builds and holds 10 to 30 psi. easily with no boost leaks. However I am only getting 11 to 14 mpg. on the highway empty. I don't have a lead foot and I excellerate moderatly to conserve fuel but to no avail. The transfer case and front hubs are properly disengaging the front end and the tires are properly inflated. Occasionally it seems like the engine cranks about 2 seconds longer than I feel is normal before the engine fires, but there is still no white/gray or other smoke. Could it be that my injectors are bad? I know this was a very common problem on the original 6.0L Powerstrokes. I have used injector cleaner additive and it made no difference. Thank you for your time and advise. TOM

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05 350 4x4 crew Had the same problem clean the injecters and let it breath put a new air filter system 225.00 on the net and I put a Banks exhaust system. 4" and had the injecters retimed.and pressure bosted 23 mpg highway /city 19 mpg running stock everthing else.Down the highway turning 2000 rpm 80 mph.And I'm not heavy on the foot.

Posted on Apr 25, 2009

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Try some of the Lucas product for diesel engines,
diesels are made for hard work/pulling. not for fuel economy
the best thing you can do is to keep the fuel filter changed as often or sooner than the manual recommends. it will be the heart to a happy diesel

Posted on Feb 23, 2009


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