I'm averaging around 20 with the last 2 tanks. Last one was 19.2 and the one before that was 21.5, although I am running 93 octane with a Jackson racing supercharger and a snow performance methanol injection kit. Supercharger is running 12 lb boost with the stock BBK tune from ford. Running a little rich. This is in a 2003 svt zx3 6MT.
2003 Screaming Yellow JR Supercharged SVTF
Hatch Nation #12