We had the 2003 Civic Hybrid and even in the worst of winter we barely dropped below 40. But Honda has "lost the magic" on the 2006 and apparently the 2007 Hybrids so I'll write to stay away from them until they issue new software.
I've called Honda America for hours and the car was in the shop for a week but no one knew that as the temperature dropped to 60F then 50F that the cars programming would kick the mileage down so far. With some near 32F weather it declined to the low 30 MPG so we miss the old model which did much better year round.
Stick with the Prius for now.
More reading about this woe at http://www.greenhybrid.com/discuss/forumdisplay.php?f=12
If you live in warm 65F+ areas the new models will do fine, but not for northern areas.
My other car is a classic 1986 560SL that slurps down premium priced, high-test fuel at the rate of one U.S. Gallon for every 15 miles of highway traveled --- that is, if I can keep my lead foot from putting it into fuel-injected afterburner. To do my part to fight Petro-Terrorism and Save The Planet as well as to conserve the ever dwindling contents of my wallet, I recently acquired a 2007 Prius Hybrid that frugally sips bargain priced, low-test Arabian Go-Juice at a nominal EPA 51/55/60 MPG.
My Mercedes Roaster put me on a first name basis with, Bubba, the owner of the corner gas station who used to smile and wave at me every time I pulled in to top-off my 26.5 U.S. Gallon tank with Premium Unleaded. Alas, my new Toyota Hybrid is working to make strangers out of Bubba and me. Now, when I Pulse & Glide silently by in Warp Stealth with the multi-function information display monitor in the Prius cockpit showing all black energy flow arrow lines and 99.9 MPG, Bubba wears a frown and no longer waves at me.
Bubba and I are becoming strangers, and I now only drive my well-muscled, fuel-hungry and high-maintenance roadster to church once a week to keep its innards lubricated.
Once I started driving my new Prius Hybrid, I was drawn to hybrid hypermiling like the proverbial moth is drawn to a flame. Grasshopper, I have now been transformed into a hypermiling Hybrid Zen Master who is At One With My Hybrid. I now work (play?) hard at driving my Prius to optimally manage the Hybrid Synergy Drive so as to cause it to deliver, and surpass the 51/55/60 EPA Fuel Economy numbers promised on the window sticker.
Are there any other residents of Buzztown who are owners and drivers of a hybrid personal transportation vehicle? If so, what brand and model is it, what kind of gas mileage do you get, and; are you an active, practicing hybrid hypermiler? JP