I hardly ever saw those numbers, more like 11-12 in town and 14-16 on the highway. However now with the supercharger and PV muffler I see more like 14-15 in town and 16-17 highway. Of course I do drive pretty fast.
2001 Ironman Daily Driver... 3.5" suspension lift (OME912 springs and 1" spring spacer), ball joint flip, 1.5" front diff. drop, 33"x12.5 TrXus MT, 16x10 Eagle Alloy rims, Interceptor, PV muffler, K&N air filter, Alpine Supercharger, Bilstein shocks, and some trimming.
2000 Ironman Project LS-1 VX... very slow progress but someday....... ohhhhh someday......