Get a bicycle....NO gas and lose weight...WIN/WIN.
Is a moped or a motorcycle an option for you?
I'd buy a geo for $2, not $2000....then take it to the junk yard....
I actually sat down and crunched numbers last summer to see how much less $$$ I would spend on gas if I bought a second car with a 35mpg rating (double the MM's mpg)....came out to ~$1200 a year, based on my driving needs/habits. (I would use ~350 gallons less than driving the MM; at the time I did these calculations, 87 octane was $3.45/gal in my area)
Then factor in I would have to put x amount $$$ up front to buy the car, then another $400/yr for plates/insurance/inspections and figured another $400/yr for maintenance. I'd be saving about $400/yr, so if I paid $2000 for a second car, I'd have to drive it for 5 years before I would realize any 'savings'....meanwhile, I'd still be driving the MM on long distance trips.