[Conga1991]

What I have is a 86.5 Supra with a rebuilt 7mgte, 57 trim, driftmotion ic set-up, 3inch exhuast all the way back (too loud for my taste) and a intake. Haven't changed the fuel pump yet, it's still the N/A pump but have a walbro fuel pump to drop in.

So, I've searched and came with nothing. I have replaced my O2 sensor a few times, it works great up until I hit boost (stock) and my cel comes on. once that does I get really shitty gas mileage, Im talking 220 miles to the tank at the most. When my O2 sensor didn't go out the needle on my gas gauge would just stick forever and not budge. Can anyone chime in on what could possibly be the problem? All help is definitely appreciated since I'm moving down to Arizona for school and don't want anymore poor mpg