As Weeks noted, I have a hybrid Civic.
My mileage varies considerably, depending on how much attention I pay when I drive. If I drive a bit aggressively, or without thought to efficiency (lots of acceleration, which really burns up gas, etc., as opposed to nice steady driving), I get about 40 mpg. If I actually pay attention, though, it improves to about 50 mpg. I get about 50 mpg – sometimes better – for long trips on the freeway, as well, if I keep the thing at a reasonable speed.
Once, having gassed up at a high-ish altitude and driven mostly downhill for many miles, my gas mileage was something like 97 mpg. That was pretty fun, but nothing like typical.
I got the Civic before the redesigned Prius came out; I hated the older version of the Prius in almost every way. The new one is apparently a much nicer car to drive. I still find the styling and that TV screen in the dashboard to be weird and distracting, but then again, under my tree-hugging, tax-and-spend liberal exterior, I’m pretty much a conservative traditionalist . . .
With gas around here as high as $2.60 (or more!) for the lowest-grade stuff, I’m really appreciating the efficiency. The super-low emmissions are nice, too, for us greenies. The newer model standard cars are improving a lot, though, on both fronts, which is awfully nice.
A nice effect for the music lover is the lack of noise at long stops, when the gas engine turns off. Perfect for a little whistle practice, or listening to your CDs/radio with no engine noise at all. . . ahhhhh.