Here is a quick mock-up of front skirts and a complete rear boattail. The length will be 20-21 feet overall, not counting the extended front end.
FOr the front, I had the idea of adding a nose on. The length is a bit much, but I wanted to relax the angle going to the hood. The black on top of the hood is the "platform" to shorten my windshield. I do think it may cause visibility problems if the height is too much.
Here is a link to a new sheet of MPG calculations using the Aero & RR tool. I have adjusted it to theoretical numbers that will come to pass... one day
I put in numbers that would reflect having lost weight, having Potenza's, lowering, complete aero mods, lean burn, turbocharger and a manual transmission. I would be ecstatic if I could really break 125 mpg between my usual 45-50 mph
Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com