What's your average MPG?

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On my stock '03 GT (5-speed), I can get 20-22 mpg out of it regularly...that's the city mileage (maybe with a slight amount of highway in there). The car has 113K miles on it.

The best I've gotten out of it was 27 mpg on the highway.
 
In a mixture of probably 40% short highway travel and 60% in town driving I usually get about 200 miles out of a full tank of gas...usually average 16mpg having an intake...throttle body..plenum....off road xpipe..catback....4.10 gears...pulleys....and street tune...Good enough for me!

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I think its a combo of things. Could be that you need a simple tune up. Or if the car has mods it is diminishing the mpg. I know when my car was stock, it got the best mpg, now that it has exhaust/cai, it went down a little bit, I guess the only way you can recover this is get a tune. Other than that tune up sounds about right if its stock.
 
My former cars at 70mph

Red 98GT-SVO Heads/blower/tuned=22mpg
Blue 98GT-bolt ons/stock gears=24-25mpg.....PI headswap/3.73 gears and stock tune=21-22mpg
Red 97gt-2.73 gears/bolt ons/ stock tune-25mpg

Current cars

2000 Ford Van=16/17mpg
2003 Z06 with dyno tune=30-31mpg(have not tested the built rear end and 3.90 gears)
2006 Honda Civic=36/37mpg
 
i get about 230-240 miles out of a full tank of city driving. i dont abuse mine though at times i do but 90 percent of the time i dont.

Edit: new plugs, new wires, coolant flush, new t stat, synthetic oil, CAI, h-pipe, 60 series flomasters, and 3:73 gears, no tune, i was told i didnt need one with what i changed out, but then agian i dunno sheet about tuning