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Thread: Looking for better fuel mileage

  1. #41
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    If you're truly looking for a high mpg pickup..................
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  2. #42
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    2 relatively inexpensive options would be to replace the belt driven cooling fan with an electric fan. Replace your muffler(s) with free flowing ones.

    Keep in mind that GM engineered the truck to maximize fuel economy in order to comply with the FED requirements for emissions and economy...
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  3. #43
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    Electric fan is a proven winner, extend the front air dam down as low as the lowest part of the suspension is as well. No tailgate is worst, topper is best, covering the rear half of bed is almost as good as full cover.

    Most gains are free, adjusting your driving "the nut behind the wheel" as ecomodder call it. Limit maximum speed and try to eliminate braking by anticipating stops & traffic. An instant feed back devise like a Scangage makes it much easier to see the improvement and is well worth the $120.

    If it is flex fuel all of mine lost 20% fuel economy running E85 vs E10, if E85 is 20% cheaper I ran it. Suburban got 15 mpg with E10, 12.5 mpg on E85. I don't know about that year but newer GM's are rated by GM to make more HP and torque on E85.

    Air up the tire some say side wall max. and when time to replace look for some that are LLR. I just run 40 psi in all mine seem like a good compromise for ride and economy and with 6 cars easy to remember.

    ecomodder dot com has a list of like 65 things to do.

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  5. #44
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    I think we're talking mass and velocity again, but on a much larger scale, though the math is the same. Big truck, big engine, needs big energy.
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  6. #45
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    I get about the same mileage 13 mpg driving my 2007 Yukon XL around town, but get about 18 mpg on the highway at 75 mph.

    I think about all ways of trying to improve my mileage, but I think the only way to do so would be if I could mate one of the newer 5 speed transmissions. I know the newer models with the improved transmissions get better mileage, but also have more aluminum parts and less weight. Maybe I look at having a old truck paid for as better than making payments on a new truck that gets some better gas mileage, but not $600 a month better mileage.
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  7. #46
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    Quote Originally Posted by Jake3501 View Post
    I get about the same mileage 13 mpg driving my 2007 Yukon XL around town, but get about 18 mpg on the highway at 75 mph.

    I think about all ways of trying to improve my mileage, but I think the only way to do so would be if I could mate one of the newer 5 speed transmissions. I know the newer models with the improved transmissions get better mileage, but also have more aluminum parts and less weight. Maybe I look at having a old truck paid for as better than making payments on a new truck that gets some better gas mileage, but not $600 a month better mileage.
    Something to consider with the new trucks getting better gas mileage. I know someone who has a new Silverado, and yes it gets better mpg when not towing anything but that's because it shuts off 4 cylinders when cruising down the highway. If you pulling a 4000 lb trailer you're probably going to be running on all 8 cylinders more often and there goes the mpg.

  8. #47
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    Nice looking truck. I've always liked those.
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  9. #48
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    The best way, in my opinion, to increase fuel mileage is to sell the gas powered PU and buy a diesel powered one.
    My F-250 4x4 supercab PU gets 17 mpg around town and up to 22 mpg at freeway speeds.

  10. #49
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    I personally, hate active fuel management in the new trucks. I bought an OBD2 plug that cancels it, and am getting around 2 more mpg, if I keep my foot out of it.
    That's not going to help with a '98 Chevy tho. I cant suggest any more than what everyone else has.
    New plugs, new wires, K&N air filter and high flow muffler.
    By the way...That's a really nice truck!
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  11. #50
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    Consider yourself fortunate. My son's 2001 Dodge with the 5.9 averages 7.5-8 mpg.

    Of course, you probably don't drive like a 16 year old boy, either.
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