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Maybe handling isn't the best term, I am looking for better highway stability and driveability. I know it is a truck, but it tends to dart around easily. I have had it for almost nine years so I am quite used to it, but my wife has a hard time of it compared to her car.
My 4.0 isn't stock, I have the 99+ XJ intake manifold (don't bother), Thorley header, cat back from a 5.9, 62mm throttle body and a FIPK. This raised my overall mpg from 18.7 stock to 21.4 I have now (averaged over the last 1000 miles). I tried a warm air intake by moving my air filter directly next to the header during winter, over 6 tanks (about 4½ months) and my mileage went down to 18.7mpg, and in mid January I switched back - it immediately went back up to 22.6 and regressed towards the mean of 21.5mpg now.
A full belly pan/air dam is in my future. Finding materials isn't easy. Finding time is harder. Much harder.
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