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My single most improvement for my fuel economy was replacing the stock muffle and exhaust piping (after cats) with Banks Power Monster 3-inch Exhaust system. I gained 0.7 mpg on city and 1.2 mpg on highway driving. The exhaust is more throaty, but I prefer the V8 sound. The only time that its ignoring is on a long long grade pull, then I turn up the tunes. Running 33's and Icon Stage One lift. I do maintain MAF & Throttle sensors and air intake filter replacement. 2014 FJC
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