The best I ever hit with my SVT is 22.8 mpg (320 to the tank) in the summer but that's with my heavy foot here and there. The worst is gonna be on this tank I think only 200 miles total. That is so horrible, but I bet everything is stock on it, I just got it not too long ago. I am guessing it needs new O2 sensors, some new plugs, maybe even an UIM cleaning. Can't wait for the Spring, my pockets can't handle this. It fluctuates though, sometimes I get around 260 miles to the tank in this frigid cold, and this last tank is by far the worst ever, I hope I break 200 haha. I am sure we have 14 gallon tanks.