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If you end up with one similar to my 2000 Jimmy, you could probably expect similar results to what I got: Air dam was good for a couple mpg (as I recall), roof rack delete was about 1/2 mpg. I tried folding the mirrors back, but only got 0.15 mpg out of it. - probably not worth it considering the loss of rearward visibility. I also tried mock-up rear fender skirts & saw no gains at all (in 3 different tests). That was sure a dissappointment. And maximum mpg speed was 40 mph. This is the 4-door version with 4.3 liter Vortec V-6 and 4-speed overdrive trans - and it's 4-wheel drive.
My thread on it is under "My 2000 Jimmy Challenge" in the "Ecomodding Central" catagory. (See thumbnail below)
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