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i have a 98f150 with a 4.6l my gas milage just keeps gettin worse. i used to get about 15-16 now im averaging around 11-12. any ideas on what could be causing this. thanks
how about your fuel injectors have they been cleaned. that helped my 98 f150 with fuel mileage.worn or low atr pressure in tires can cause fuel mileage drop also.and as Beechkid posted the tps,iac ,or cat.hope this helps
Well, winter gas gets worse mileage than summer gas so it will be a little lower. Also letting the truck warm up burns more gas as well. What brand of plugs did you use?