I had a 3800 in an olds 88 and was able to get 30 mpg without trying and even managed to get 42 mpg once or twice. That was a thrill. The body rusted out and the engine cradle started falling out so I am now in the process of putting the 3800 into my wife's old car, a sunfire. The 3800 is a great engine with a lot of potential. I rank it right up next to the ford 300. It will run forever with very little maintenance and gets good mileage while producing loads of power.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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