I keep track of my FE by temperature. So as a comparison of hybrid vs non-hybrid, here is what I see as far as increased fuel consumption during cold weather (sorry, too lazy to convert to MPG, but you get the idea). Of course it's not a perfect comparison as my TCH is usually driven to optimize FE 90% of the time whereas the Sienna is driven with best FE in mind maybe 50% of the time. I imagine the "optimized" driving style takes a bigger hit in colder weather. Given the same driving style I think the hybrid would still take a bigger hit % wise in cold weather, but only slightly and still be an improvement over a compariable standard powered vehicle:


Temp ..... Hybrid Camry ...... 2004 Sienna
Warm ..... 6.11 L/100km ...... 11.79 L/100km
Mild ..... 6.30 (+3.1%) ...... 12.30 (+4.3%)
Cool ..... 7.25 (+18.7%) ..... 12.95 (+9.8%)
Cold ..... 8.17 (+33.7%) ..... 14.28 (+21.1%)

Two climate control systems, one inside and the other at the tailpipe.

2007 Camry Hybrid (in service June 2006)
FE: 6.77L/100km (34.8 mpg) over 37750km (23450mi)
75% city - Ave trip 20 min - 2 Winters