<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2006-07-15 21:30, bassman97 wrote:
Shouldn't be much of a problem, especially the 20 mpg provided that you keep the rpms down on the highway. In the recent Car Craft, a guy got 25 mpg out of his 80's Trans Am while pulling off a 12.88 1/4 mile on a mild, N/A car.
However, the new Mustang GT does have potential. If you don't have the money for a GT500, then simply build your own. </BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

I'd be thinking there is a huge difference between 12.8/25mpg and 9's (or 10's)/20mpg....even a GT500 is pushing things and its blown.....running 9's and 20mpg especially N/A would be real hard, you are probably going to need 700hp+ to get you there in a "street" ride.
Turbo is probably the best option but running boost and fuel economy don't seem to go together real well either, as the a/f ratio needs to be fairly rich for "safe" operation....meaning, forget about 14.7 : 1 a/f ratio's under boost.
However on the plus side, you could run a boost controller in conjunction with engine management system. Atleast with daily running, you could screw the boost down which would help you with your economy goal.
You would also need to give serious consideration as to what fuel you intend to run in such a setup. Pump gas just mightn't cut the mustard.....E85 may be just the ticket ....if its available in your area. It would handle the turbo option much better and let you run alittle more timing as well as eliminate the need for meth injection kits and such.
Hey..the more I think about this, the better it sounds. I seriously doubt if N/A could get anywhere near your goals but a turbo.....just might.