I have the same problem... except i got maybe a little more. Def stay on the vaccum side when accelerating, no sudden accels, don't rev at people too much. Just be a good boy about driving it cuz if ur boosting you will definitely waste a ton of gas. Just for the record i haven't gone further than 145 miles on a single tank. Also i hear even though the gas light goes on you can drive it another 80-100 miles. It's when the gas light starts blinking that you know ur in trouble.
I've kept track of every tank since new. I averaged 20-22 before stage-2 and now I'm at 19-21. I've had a high of 23.xxx and a low of 17.xxx It's always been 93 oct. and same gas station. I usually fill up around 175 mi. I don't really care what I'm getting, but I was just curious so I kept a log on it.
I'm at about 4000 miles on my 04, and I've had a low of 22 per gal and a high of 24 per gal. I only use Sunnoco 94, so I fill up at random times depending on my location. I don't like to run it down into the red. And yes, I drive the pizz outa the car.
Last weekend I got about 260miles on 9gallons. Gas light was not on and the gas pump clicked off around 8.5 gallons. I made the pump stop at $18 . This included abut 70miles of driving in the moutains (skyline drive) and then stop and go and downhill driving and then about 2 hours of highway speeds.
That was a nice 27- 28mpg. I think I could have gone about 40 - 50 more miles before the light was on.
I Avg about 120 - 150miles on a tank other times (I got a heavy foot and most of my driving it traffic on the beltway)
I have 15,000 miles on it now.
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