Actually, now that someone brought this up-
In my car, I routinely get only 15-18 no matter where I am, 18 being the best with mostly highway driving. Now, the facts about my car-
162000 miles
Mototron 60lb/hr (trimmed duty cycle)
Stock turbo (dead seals..leaks oil under heavy boost)
Hooker 2.5" cat back
TurboTweak 93 octane chip (incorrect boost- set for 17, I only run 12...no controller yet)
Passenger side exhaust manifold either has a blown gasket or something...bad exhaust/fuel odor under boost, almost instant after w.o.t. (no visible fuel leaks in engine compartment)
And I can smell gas on the drivers side when I walk up to the car sometimes...fuel feed and return lines are solid...havent checked the vapor line yet.
I haven't checked my readings since I got my engine back together...but before, all readings were fine on the scanmaster, except knock (due to 18 psi on stock chip..thank you, vacuum leaks..haha).
I will admit there's so much oil in the intake system that its plugging up the IAC from time to time...oil leaks from the bolts that hold it to the TB
The mileage was ****ty back in the day when the car was back on the road after 2 years of sitting..I was only getting maybe 13 mpg on a good day.
As far as other things go, the MAF is fine, 02 is fine, and I havent checked the TPS output yet...
Best mileage on a single tank? 280-290... I just feel like with the driving I do Im at the pump every couple of days.
Insight please! Sorry for stealing the topic- I was equally as curious about my own situation.
Thanks