First day over 50 degrees (was 48 when I left home, 55 when I arrived at work) since I've had my Prius, and today I topped 48 mpg for the tank average (I've got about 250 miles on the tank so far) for the first time! (Well, not counting the first 75 miles or so, when it's still bouncing around.) I think it'll be up to 50 mpg or so by the time I get home this evening. What really amazed me was how much longer (as a percentage of drive time) I was running at or (very close to) 99.9 mpg! Boy, I REALLY can't wait for summer weather, I don't think it will be hard to hit 60 mpg then!