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Old 04-17-2011, 11:13 AM   #1 (permalink)
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What to do to increase mpg?

97 12v extended cab dually, 5 spd. Basically stock. What are the mods to do to it to help improve fuel mileage.
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Old 04-17-2011, 12:52 PM   #2 (permalink)
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Intake and Exhaust would help alittle.
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Old 04-17-2011, 01:12 PM   #3 (permalink)
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tune your afc. at one point i had my truck getting pretty consistently over 22mpg with mixed driving. but if you tow a lot that setup isnt really feasible.
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Old 04-17-2011, 10:17 PM   #4 (permalink)
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do a search and you will find a ton of threads started on this very topic. and beat to death.
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Old 04-18-2011, 01:20 AM   #5 (permalink)
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On the towing, what does it hurt to have your AFC tuned that way?
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Old 04-18-2011, 01:34 AM   #6 (permalink)
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bump your timing a couple degrees.
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Old 04-18-2011, 08:56 AM   #7 (permalink)
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it doesnt "hurt" anything its just not very fun to tow. I just tuned and tuned until essentially my smoke screw was all as far up as it could go and it would only fuel as much as needed to get me up to highway speeds....i still pulled with it like that but you are certainly not going to go anywhere fast haha.
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Old 04-18-2011, 09:06 AM   #8 (permalink)
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Besides the things you'll find on this forum, you can change the way you drive. Not some crazy kind of driving, but some subtle things to more or less burn less fuel. Tons of tips here and here.

Note that not all of these are feasible with our trucks, not to mention that many things are for gas engines.

The big one I would start doing is to conserve momentum. Say you see a red light ahead. Don't change up to it and stop as soon as you get there; rather, start coasting and maybe hit the brakes early to slow you down so that you get to the light and are still moving when it becomes green.
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Old 04-18-2011, 11:28 AM   #9 (permalink)
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go get yourself a pipe union that reduces from 4 inches to 2 or 3 then use some bushings to make it smaller yet until you can put the male part of an air hose on. put that on your turbo inlet and use a regulator to take it to 15 lbs and spray all your joints and places that operate of of turbo pressure with soapy water (waste gate, afc housing and plumbing, intake manifold). if there isnt any leaks good deal if there is they should be fixed before you spend any time or money on anything else
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