Joseph -
Rats on the tranny but Kudos on the hatch. I really like that design. IMO, the built-in spoiler was always such a clean design element. Maybe you could extend that spoiler out into a Kamm-back after you have established a baseline MPG. Since you are pre-OBDII, you may want to look at the guino real-time MPG calculator project :
guino release one workspace
http://forum.ecomodder.com/showthrea...15.html?t=2115
CarloSW2