2003 Civic GX (runs on natural gas) with an expired tank for $500:
https://www.govdeals.com/index.cfm?f...23&acctid=7436 This is one was owned by the ports and has <30,000 miles, so it was probably only driven around at neighborhood speeds.
EPA rated for 31mpg, but these days CNG costs about half of gasoline so economically (and emission-ally) it far exceeds 35mpg. Cleaner burning & domestically sourced fuel to boot! You can even rig up a system to fill it at home.
The downsides:
150-200 mile range, the useable trunk space is about half as deep, it doesn't make as much power as gasoline, and CNG stations are pretty rare. Oh and that expired CNG tank would cost ~$2500 to replace if you took it to a shop (vs assuming the liability of filling it on your own). Automotive CNG tanks were initially certified for 15 years, but are now certified for 25...