I'm going to be doing the same pretty soon. I drive about 20-25k miles each year traveling for work, and my V8 Lincoln LS requires premium. I average about 17 mpg around town, and at BEST get 26 mpg on the highway - that means fill ups north of $60, nearly $70 in places like Miami and NY (18 gal tank is good for 400-450 miles on the highway, though). With the mileage I'm putting down, I'm going to buy a new Dodge just for the lifetime powertrain warranty. The Caliber R/T with manual transmission is under $20k sticker, before negotiations and promotions. It's got all the comfort stuff that I need for long hauls on the road, a bunch of space, and better overall mileage than my LS - and it runs on 87 octane.
It's also not too shabby looking.