Eliminating imports entirely and focusing on something a little "different":
1995-1999 Plymouth Neon ACR
1998-1999 Dodge Neon R/T
These original sporty versions of the Neon are the best of the breed. Nice 150hp twincam engine and good handling, they were put together by people who really took time to impart sporty driving qualities rather than just adding a silly bodykit. you should be able to get one cheeeeep and they should easily exceed your gas mileage needs.
2000+ Ford Focus ZX3 hatchback
2005-2007 Ford Focus ST sedan
2002-2004 Ford SVT Focus
The Mk1 Focus, despite being an old design, is still a good car in hatchback form - efficient, reasonably quick and attractive. I find the sedans hideous but if you can stomach them then the ST model has the 151hp engine. The SVT Focus is one of the best cars made in the US in the last decade - great little Cosworth engine, enhanced handling capabilities, and a sharp but tasteful body kit.
Ford Contour SE V6
Ford SVT Contour
The Contour was hugely underrated here in the US, but its 172hp 2.5L V6 is a very smooth engine. The SVT model boasts a 195-200hp version of the same engine and some additional go-fast bits.
Foreign stuff
I know you want to "buy American", but you should also consider foreign cars, because there are some damned good ones like: Volkswagen Golf/Jetta, Nissan Altima/Sentra/240SX, Honda Civic, Scion tC, old BMW 3-series, Subaru Impreza 2.5RS, Mazda MP3 and quite a few more.
For trucks, consider a 4cyl Toyota Tacoma or Nissan Frontier. The 2WD models usually get 25mpg or better. The Ford Ranger is not American, it's a Mazda - and that's probably why it's a great little truck. Also a good option.
1995-1999 Plymouth Neon ACR
1998-1999 Dodge Neon R/T
These original sporty versions of the Neon are the best of the breed. Nice 150hp twincam engine and good handling, they were put together by people who really took time to impart sporty driving qualities rather than just adding a silly bodykit. you should be able to get one cheeeeep and they should easily exceed your gas mileage needs.
2000+ Ford Focus ZX3 hatchback
2005-2007 Ford Focus ST sedan
2002-2004 Ford SVT Focus
The Mk1 Focus, despite being an old design, is still a good car in hatchback form - efficient, reasonably quick and attractive. I find the sedans hideous but if you can stomach them then the ST model has the 151hp engine. The SVT Focus is one of the best cars made in the US in the last decade - great little Cosworth engine, enhanced handling capabilities, and a sharp but tasteful body kit.
Ford Contour SE V6
Ford SVT Contour
The Contour was hugely underrated here in the US, but its 172hp 2.5L V6 is a very smooth engine. The SVT model boasts a 195-200hp version of the same engine and some additional go-fast bits.
Foreign stuff
I know you want to "buy American", but you should also consider foreign cars, because there are some damned good ones like: Volkswagen Golf/Jetta, Nissan Altima/Sentra/240SX, Honda Civic, Scion tC, old BMW 3-series, Subaru Impreza 2.5RS, Mazda MP3 and quite a few more.
For trucks, consider a 4cyl Toyota Tacoma or Nissan Frontier. The 2WD models usually get 25mpg or better. The Ford Ranger is not American, it's a Mazda - and that's probably why it's a great little truck. Also a good option.