- Sep 27, 2004
- 213
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Ever since I installed my jlt intake and bama 91 tune I lost 75-100 miles per tank! I thought it was supposed to improve mpg's. 97 percent of my weekly driving is all highway 75-80mph. Could a dirty fuel filter make that big of a diffrence? Ive never changed that or the spark plugs shes got 39k miles..k and n gets a cleaning every other oil change. She runs great no hesitation or anything I cant figure why mpg's dropped so much...