Well, it's been only 10 months for me, but I thought the following comparison might be of interest. I compared the fuel usage of my previous 1993 Camry V6 LE (3.0 liter, 185 hp) for the 10-month period July 2005 through May 2006, to my 2007 TCH (187 total hp, and about as peppy as the V6 was) for the comparable 10-month period July 2006 through May 2007. This period includes last summer, fall, and winter. My driving is largely in-town, short-trip (maybe 2/3rds of the total mileage) and 1/3 on the highway. This is what I found:

Camry V6 — 12 296 km / 1 463 L => 11.9 L/100 km = 19.8 mpgUS = 23.7 mpgIMP

Camry Hybrid — 13 857 km / 963.4 L => 6.95 L/100 km = 33.8 mpgUS = 40.6 mpgIMP

That's a 42% overall reduction in gasoline usage (i.e., a 42% improvement in fuel efficiency) from switching to the hybrid. I'm impressed! Yes, the hybrid's FE drops dramatically in winter stop-start driving here in Ontario, but so does the FE of regular vehicles.

Stan

P.S. I had a block heater fitted at the end of last year, after I saw how long it took for the car to reach operating temperature when the weather was cold. In two-and-a-half hours the block heater raises the block temperature by ~30 degrees Celsius above the ambient temperature. This makes warm-up very much faster, reduces ICE wear, provides cabin heat sooner, and at 10 cents/kWh costs me only ~10 cents per day — definitely less than the cost of the fuel saved.