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on my jeep the exhaust feel off just before the muffler witch is half way down the side of the tranny and got 21mpg but couldn't reregister it tell i got a new exhaust and i could only afford the stock exhaust witch droped me back to the epa estimated 16mpg city and 18 mpg highway but then i remembered the thing about using acetone to increase FE and it jumped me back up to 21mpg so i think i'm going to try to get the lower back pressure for my jeep.
p.s. has anyone tried cryogenic processing? this guy supposedly did it to he's prius motor and went from 60mpg to 120mpg and also got 50% more power, and he's motor goes 3-5 times longer between rebuilds
p.s.s hey comptiger5000 i was thinking of getting a 1987 jeep cherokee it supposedly has a manual steering box and a 5 speed manual transmission that i want to swap into my grand and a I6 that i can rebuild how i want to what do u think??? will it work???
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