Anticipation (gas prices) and looking for 3 years to replace our "old reliable" 1992 Pontiac Bonneville were the main motivations for purchasing our Honda Hybrid. I drive a one hour round trip commute every day to work and now only take 1/2 tank a week whereas the Pontiac had to filled every week. I know I save $60+ every month! It does seem to do better in cooler weather -- this morning (Nov. 9th) my gas mpg was 50.9 as I pulled into my parking spot. You do need to learn to drive a little differently (mostly braking gradually), but worth it! Fun thing: freak people out with how the engine and ac turn off when you stop -- can let up on brake to have ac turn back on in our humid climate.
Gas mileage, cd/radio, small size - chose over Toyota Prius since liked exterior design being similar to other Civics