still no change in mpg
#1
still no change in mpg
i have done the valve job on my engine to 8 and 18 thousandths. i have installed a bhaf on the stock air tube and still no change in mpg. it doesnt matter if i goose it or im driving it like a grandpa, or pulling my 23 foot horse trailer and running empty it gets between 10 and 12 mpg. the only thing i havent done is have my timing advanced. is it safe to advance timing with 276 thousand miles and without head studs?
#5
this may sound stupid , if so forgive me but
fuel filter been replaced ?
i would do a volume test for lift pump as a starting point mainly because
low side pressure is just as important as the high side
pressure might be good but volume bad, 12mpg is pretty low even hauling
4.10s and a combination of other stuff wrong could produce bad milage like that
good luck
scott
fuel filter been replaced ?
i would do a volume test for lift pump as a starting point mainly because
low side pressure is just as important as the high side
pressure might be good but volume bad, 12mpg is pretty low even hauling
4.10s and a combination of other stuff wrong could produce bad milage like that
good luck
scott
#8
#9
Do you have 4:10s? im in the same boat as the OP i have finally just put my truck back stock with intake and exhaust and hope for better than my last tank which was 12.9 mpg, and that was absolutely babying it. i would love to know how people are getting 20+ mpg
#10
I'm not positive, but I'm pretty sure when I rebuilt the rear last year it had 3.73's.
Sliding my fuel plate forward gained me a couple, I used to get 19-20 once in a blue moon when everything went just right while running the tank, now I can do it easily. Everyone I know who I have personally witnessed get 20+ has bumped their timing. The 12V guru around here is running twins, ran low tens at the track and gets 25mpg with his daily driver, his is bumped to 22 degrees. The conventional wisdom I've picked up here says this is insanity, but other than being a little harder to start when it's cold out he hasn't had any issues and he's been building these trucks for like, fifteen years. Still, most of the guys I know are running around 17 degrees and had noticeable improvement in mpg.
Sliding my fuel plate forward gained me a couple, I used to get 19-20 once in a blue moon when everything went just right while running the tank, now I can do it easily. Everyone I know who I have personally witnessed get 20+ has bumped their timing. The 12V guru around here is running twins, ran low tens at the track and gets 25mpg with his daily driver, his is bumped to 22 degrees. The conventional wisdom I've picked up here says this is insanity, but other than being a little harder to start when it's cold out he hasn't had any issues and he's been building these trucks for like, fifteen years. Still, most of the guys I know are running around 17 degrees and had noticeable improvement in mpg.
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Cumminsaddict (02-13-2013)