I purchased my 2007 Camry Hybrid in August 2006 and enjoyed excellent gas mileage through most of the fall here in New England. I was so impressed I convinced my sister in Oregon to also purchase one. She bought hers in December.
Almost immediately she started to complain that the gas mileage she was getting was no where near what I had been reporting and that she got better mileage with her nine year old Corolla.
After talking though driving style and other issues, I checked my own gas mileage and noticed that mine had dropped as well. And then when the weather turned very cold (-10 to +15 F) in mid January, the mileage got down right bad.
My sister's Toyota dealer told her the mileage difference was due to the "winter blend" of fuel. My dealer told did not try to explain the reason but indicated other owners were complaining of as much as a "12 MPG drop."
I have been looking for data to support my observations and wonder if you would be willing to share your MPG data. You may respond to the message here or contact me via e-mail jeb(at)jebswebs-dot-com.
My own data:
August - November - 38-40 MPG (this is combined highway and city) January - February - 27 - 30 MPG (except for a trip from Maine to NC in which I got 36-38 MPG - all highway driving)
Thanks for your input
PS: I am now experimenting with the ECO button and will be compiling more data.
~jeb