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hmmm... it sounds like there are some mechanical limits to your fuel economy there. I would say see about aeromodding it as a cinderblock on wheels isn't a good desing. The slower you go the better. If you let off the pedal it doesn't shift up? If that is the case i would say just go slow and accelerate gently. What kind of fuel economy are you getting out of it currently? Also is your engine tuned well, air filter clean, tires inflated higher than reccomended, a/c off(if equipped), fuel filter not gummed up(sometime a problem on diesels) that's all i can think of at the moment.
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