So I was on here over the summer, but I took a break for a bit because getting more mpg out of a Jeep Cherokee was a PITA. I'm in the process of rebuilding the Jeep's transmission and I need something to get me around town and to/from school. I just picked up a 5spd 1996 Saturn SC2.
The Saturn should be a much better platform for fuel economy than the Jeep. I'll be testing its current economy once I get back up to school (cheaper gas). Once I know that everything's in working order, I'll probably do some aero stuff.
I see no reason why fuel economy and power cannot coexist.