I think you're in the ballpark for daily driving - that'* about what we get on our 93 SSE around town...a little better than 20. If it dips below that I'll dump a can of injector cleaner into the tank and that usually brings it back up.
I noticed in your sig that you can only get about 107 mph out of your car. Does anyone know if these things have a governor of some sort in them, mine maxed out at about the same speed?
Before anyone calls the cops, I live within 1.5 hours of the BONNEVILLE salt flats.