yeah the 2.2 will be better on gas....the 3.1 is pretty much a boat anchor and not worth the time , effort and money it takes to put it in.
you can always go to the junk yard and get a 2.4.... but i recommend getting an rsm supercharger and new injectors with it.....
the superchager is 3500 bucks, new injectors are like 300 then how ever much to get the thing installed
2000 Dark metallica green cavalier. (2.2 2200) pace setter 4-1 header, magna flow cat, dual quad tip dtm muffler, 1800 watt stereo with satalite radio, momo 16in rims, from rk sport strut bar, rear vibrant strut bar, indeglow gauge cluster along with matching hvac panel, clear corner lenses, altezz tails, vibrant wai, carbon fiber oem style hood, rsm lightened crank pulley, MSD Ignition coil packs, RSM Vortech Supercharger 8psi
"Disarters are just another star falling in my yard."