Have you seen this thread?
Screw Hypermiling Techniques: I'm just plain happy my car works in this weather!
I don't commute regularly, but this month I've been watching a house for friends who are away in FLA. (Smart them - Feb has been truly winterish.) I've been making a round trip nearly every day...
- The hardest part of hypermiling in -10 to -20 C weather is the car doesn't really warm up (for the length of drive I'm doing). Even using a block heater, the temp gauge is JUST approaching normal after about 6 km (4 mi) of driving. So I've had to add another step to the procedure: when killing the ICE to coast, also kill the heater fan, or you'll end up bleeding
all the heat from the core and slowing down the warm up period even more.
- I've started pre-warming the car's interior with a 750watt 120v space heater
- It can be difficult to clutch-start the car in very slick conditions (wheels just slide, as they would if you stepped on the brakes with too much pressure)
- high speed cornering to maintain momentum may not be an option (see above)
- Getting out of people's way is more difficult. E.g. I'll typically signal and coast onto the shoulder to encourage a (faster) following car to pass me, but that's not as much of an option when the shoulder is a snow bank.
- I never idle to warm up, but in really cold weather in the past 2 days I have idled at the
end of trips to ensure the battery is topped up for the next one (sort of what clencher mentioned). Hypermiling is hard on batteries, and this is more evident in the cold when their performance is already compromised.
- it's much easier to get the car efficiently pointed, ***-end, into a parking spot in the winter though: handbrake!