Scott, last December I looked in to mitigation strategy for the coming fuel crisis and outlined some of the highest MPG cars I could find
http://fueleconomy.gov/
Here are some models from that list:
Diesel
1985 Ford Tempo 4 cyl, 2.0 L, Manual 5-spd, 31/39
1985 Ford Escort Wagon 4 cyl, 2.0 L, Manual 5-spd, CA 31/39
1985 Ford Escort 4 cyl, 2.0 L, Manual 5-spd, 36/46
1985 Chevrolet Chevette 4 cyl, 1.8 L, Manual 5-spd, 33/41
1985 Mazda 626 4 cyl, 2.0 L, Manual 5-spd, 31/38
1985 Volkswagen Quantum 4 cyl, 1.6 L, Manual 5-spd, 28/35
1985 Volkswagen Quantum Wagon 4 cyl, 1.6 L,Manual 5-spd 28/35
1985 Volkswagen Golf/GTI 4 cyl, 1.6 L, Manual 5-spd, 31/41
1985 Volkswagen Jetta 4 cyl, 1.6 L, Manual 5-spd, 31/41
1996 Volkswagen Jetta 4 cyl, 1.9 L, Manual 5-spd, 34/44
1999 Volkswagen New Golf 4 cyl, 1.9 L, Manual 5-spd, 35/44
2000 Volkswagen Golf 4 cyl, 1.9 L, Manual 5-spd, 35/44
Regular
1994 Ford Aspire 4 cyl, 1.2 L, Manual 5-spd 31/39
1995 Ford Aspire 4 cyl, 1.3 L, Manual 5-spd, 31/38
1994 Pontiac Firefly 3 cyl, 1.0 L, Manual 5-spd, 38/45
1994 Chevrolet Sprint 3 cyl, 1.0 L, Manual 5-spd, 38/45
1994 Suzuki Swift 4 cyl, 1.3 L, Manual 5-spd, 31/39
1994 Geo Metro XFI 3 cyl, 1.0 L, Manual 5-spd, 43/51
1996 Geo Metro 3 cyl, 1.0 L, Manual 5-spd, 37/44
1996 Geo Metro 4 cyl, 1.3 L, Manual 5-spd, 33/39
1988 Honda Civic CRX HF 4 cyl, 1.5 L, Manual 5-spd 41/50
1995 Honda Civic HB VX 4 cyl, 1.5 L, Manual 5-spd 39/50
1996 Honda Civic HX 4 cyl, 1.6 L, Manual 5-spd 33/41
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I found that Civic VX offered the best combination of utility (cargo space, AC, 5 seats) and MPG (topped only buy Geo Metro XFI Unobtanium). I did not consider hybrids due to battery pack cost. I found that Geo Metro had worse fuel economy, while also having smaller engine and less seats/cargo space, and so did Ford Aspire and Toyota Tercel. Larger cars from Ford, Toyota (e.g. Escort, Corolla) are even less fuel efficient.
I think you can find VX for under 2K if you look for a few weeks. I think it's the best we have right now if utility and top MPG are your goals.
Before you settle down, I also suggest you check MPG stats of cars you are considering here
http://fueleconomy.gov/ - numbers don't lie, and they go back to 1985.
Good luck
Ross