A few cars worth mentioning:
Late 90's Sentra - 25 city/ 35 hwy , and widely available
Ford Festiva - widely available; earlier models got better FE
Toyota Tercel
Mazda Protege
Pontiac Sunfire
I didn't see any of these listed. All of them are relatively fuel efficient. If you modded any one of them, you could easily reach 40 MPG.
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