I have a Prius that i've been pleased with. It's been a while since I checked the average MPG but when I did it was 52. Seems as it gets older it might be a little lower but still around 49ish i'd guess.

I know someone who bought one of the larger Toyota hybrids and I was kind of shocked when they told me the mileage it was supposed to get because it didn't seem any better than what i was getting with my Nissan Quest v6.