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wow that sucks. my 4.7 gets about 17/18 around town 20/22 on the highway. i may not have the power you guys put out but your mileage should be better than that
i only get probably 12 city and 16 highway its even lower right now cause im pretty sure an o2 sensor just went cause the check engine light is on and im wasting 2x as much gas now, the code said somethin bout a cat deffiency? i think...maybe..i dunno he said he could be the cat or the last 2 o2 sensors but i just replaced the cat probably 6 months ago so i dunno