Sorry it's taken so long to get back to this thread, but there really is no secret (as far as I know) to get good gas mileage with the Crossfire. Even though the EPA rates the automatics higher, I think the 6 spds can beat em.
I used my car for work yesterday, and put over 350 miles on it. I filled it up to the brim before I started my trip, and again this evening when I filled up. (So I'm sure about exactly how much gasoline I used).
The first part of my trip was Canton to Cleveland, then Cleveland to Pittsburg, all on the Interstates, between 65 and 75 mph. About 25 miles of stop & go city driving in Pittsburg, (sometimes a little heavy on the throttle just to keep from getting run over). On the trip home, I took secondary roads, lots of down and upshifting for the first 1/2 of the trip, and probably averaged 45 mph. But the second 1/2 of the trip home I was moving pretty good, and ran better than 55 or 60 mph (still on 2 lane country roads) with a lot more shifting than I would have been doing on the Interstates.
Then today, 65 miles on mostly 2 lane roads averaging about 50 mph.
The end result, 29.4 mpg.
My car just turned 37k yesterday, completely stock, original air filters, and plugs, and I drive with my window down most of the time, and the AC wasn't on. Oh yeah, my wing is ALWAYS down. No hyper-mileage techniques, and no "Tornado".
I do coast when ever I can, as long as I can stay with the flow of traffic, and I try to stay off the brakes as much as possible. I hardly ever down shift to "slow" down, (brake pads cost so much less than replacing a clutch anyway).
My very good friend usually gets better mileage than I do with his Base Crossfire. But "Base" cars do weigh a little less, but I think it's just because he's a better driver than I am.
I'm not exactly sure what a "Scangauge II" is, but an ordinary "vacuum" gauge will help to teach ya to stay off the throttle.