my 09 prius is continually dropping in mpg. i know not to expect epa miles and understand i should see fluctuations for cold weather. i have 6 friends in my county with priuses that are ALL getting 48-51 mpg regularly with about a 2-4 mpg drop for our cold weather, without any grill modifications, etc. i've had one of them drive my car, too. she didn't get any better than i did. i am a conservative driver. hoping i didn't get a lemon and that you all will tell me you used to get 34mpg and the break-in period really did make a REAL and significant increase in mpg! i got it with 12 miles and it now has about 1800miles on it after about 2 months. yes...i am a newbie in freak-out mode (though i've been doing my research) and want you to make me feel happy about my prius!!! it has never averaged a tank above 40 mpg.