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well i have full exaust, header, hi flow cat, and a flowmaster, and a new intake(not the one on my cardomain) and i get 27mpg in the city and 33 hiway. on 94octane i get 35 mpg hiway. but in the summer its less, and winter more, obviously. so the guy with 21mpg...that sux dood, i dont know what to tell you, get a k&n, coolant flush, tranny flush, and oil cleaner/change, fuel system cleaner, and see if that does anything. other than that you have emissions systems problems..good luck man
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