Quote:
Originally Posted by Goldenstate
A friend of mine recently installed a Magnaflow exhaust system on his 1999 Jeep with 6 cylinder engine. He also went from 10 inch tires to 7 inch wide tires. Next came synthetic oil in the engine, transfer case and both differentials. I believe he used Royal Purple lubricants. He was hoping for 3 MPG and was able to gain 5-6 miles per gallon. Not sure what he is going to do next.
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Did he go with significantly shorter tires as well and not recalculate the speedometer/odometer/trip changes?
I had a 2001 Wrangler with the 4.0 straight six. I can say adding an intake did about 0.3 mpg better, but at the same time we were going from winter to summer gas, so a gain was expected. I later added a Magnaflow cat-back, and switched diffs and engine to Mobile1, neither which netted a gain (and for a while I was driving 204 miles every day round trip for work). Transfercase and transmission were already synthetic from the factory, and replaced with the same quite often as a preventative maintenance (lots of towing, lots of off roading, occasional questionable water depth).