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Re: Bolt on efi?
Efi alone will get you so far you need a overdrive trans to really get better mileage.If it was me i would use the tbi these trucks got later on or tpi off a 3rd gen f body and a 700r4 and regear the rear end.If you want max mileage out the truck a diesel swap can break 20mpg easy but is costly to do.
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