MP thanks for the reply on the "C", at least one more question, what time period was this? mid to late 90's.
Jbell, the fuel, torque, HP, vs RPM curves are outstanding!! Loads of good information.

About lowering HP needs, the 10 bolt rearend has the lowest HP lose, better then 12 bolt, 14 bolt is not even close. For the 10 bolt rear you can use aluminum drums from Trans Ams, Formula, certain Buick Gran Nationals, and a limited number of station wagons that came w/ this rear. Lowering the rotating weight of drive train helps mileage, and more then other weight in the vehicle. I think it may be something like 1 pound from drivetrain rotating mass is equal to 4 pounds of static vehicle weight. Therefor tires, wheels, drive shaft, transmission and differential rotating parts are all potential areas for improving milage by reducing their weight.

Another area is friction in the power train.

Tire design and size are also areas of measurable improvemnent as mentioned above.

For me the biggest improvement would be to get rid of the hills here in Kentucky!

thanks for the information,
Les