Coming on winter here in Alabama and the Chevette seems to not heat up much. I bought a new thermostat and wondered if there is anything I need to be careful of when replacing it. Looks pretty standard, but don't want to make a mistake everyone else has already made. Second, I was wondering what MPG others are getting. In the summer I got pretty good (30-ish), now with it getting/staying cold, I'm not getting near that. Could be the thermostat thing, don't know.