[hendgeofdeath]

I just sold a 99 s-dime, 2.2 liter. With an extend cab and 5 speed.
First off I feel your pain for a 2.2 you would think decent mileage I was averaging 20 mpg, luckily with the 5 speed it allowed me to play with the gears and put it in neutral to coast up to stop signs after just doing that I was closer to 26mpgs. Gealii has some great tips the only thing I would add is to do a complete tune of the engine; check the gaps in the spark plugs, keep the oil and air filter clean, and run the max psi in your tires allowed. Good luck