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Old 05-20-2009, 09:23 AM
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MPG's?

Alright, so here lately my mpg have begun to suffer dropping from around 16.9 in the city to the mid 15's. I am not understanding why. I cleaned my filter, changed fuel filters and used some BBK diesel injector cleaner. I cannot figure out what it is. I was told that I might be able to update my firmware on my Xcal 3 but havent had any luck with SCT. Anybody got any ideas as to what could be causin this. Oh and I havent put on new tires or changed tire size and I keep my tires properly inflated. i am stuck??????
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Old 05-20-2009, 09:34 AM
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I'm lucky to get 12mpg in the city, and barely 16.5 on the highway running 65.
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Old 05-20-2009, 04:16 PM
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I used to get about 19 on the highway but it is just suffering lately. Also, one more thing how can I fix turbo lag. A buddy of mine has a 6.0 with a bully dog on it and turbo lag is almost non existent. His is 2 years newer than mine but I have driven other 6.0s around that year that have more lag, but not as much as mine.
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Old 05-20-2009, 04:19 PM
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Turbo lag is all in the tuning. Get a good custom tune and you can have almost zero lag.
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Old 05-20-2009, 07:15 PM
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i get 18-19 runnin 75-80 on the highway and anywhere from 15.5 to 16 in the city depends on how i drive.........have you possibly got new boots? maybe they weigh more lol
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Old 05-20-2009, 07:21 PM
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maybe its the diesel injector cleaner have you changed your oil lately?
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Old 05-22-2009, 06:21 AM
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i wish i was gettin those kinda numbers. 14.3 on the lieometer, runnin 70mph with the cruise on.
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Old 05-22-2009, 11:49 AM
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14.3 on the lie o meter I get 13.5-14.5 generally last tank was a little hiway with a lot of city got me 15.47. Have you had a dealer visit? Firm ware should not affect milage. The tune might though. Have you been carring more weight possibly?
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Old 05-22-2009, 02:02 PM
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I only get thirteen on the highway running about 75, but I am spinning 35" tires on a 20x12 wheel . I wish I could get your so called bad mileage, Ha Ha !
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Old 05-22-2009, 02:43 PM
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Is that corrected milage? I would think with 35" tires you would be running a little lower rpm anf get great mpgs. unless you have a lot of lift and really heavy wheel and tire combo. I'm planning on either 33 or 35" tires on stock rims when I get to the steels on my truck. My mpgs are best at 60-65 so I plan on running that rpm but using the tires to get 70-70mph
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