I'm getting 18mpg with mine, all country/rural driving, 7 mile each way commute. I think a nice, fresh bottle of sea-foam added to your tank, new tune-up stuff, and a front end alignment will do you wonders! Plus, drive the crap out of too! Mine sat for a long time before I bought it, and I made a point to use up the first tank of gas that first week-end! LOL! It just keeps getting better and better! Even starts reliably at -22°f!

Mine too warms up slowly, but it does warm up. I have a new thermostat for it, I just didn't get it installed soon enough for winter. I'll do it in the spring.