[Diesel_Dave]

Has anyone ever seen any data for tire rolling resistance vs temperature? I've searched around and so far haven't been able to find anything.

From my own experience, I know that it goes up significantly as the temperature drops. For example, I typically back into my driveway (which slopes off towards teh street. The street is basically flat for about 100 ft or so and then slopes down slightly out to the first stop sign. Typically, I just start out in neutral in the driveway and just coast to the stop sign. I never get going very fast (3-4 mph tops). When it's really cold, however, (<20 deg F), I usually can't make it past the flat spot on the road and I have to start using the starter.

Another example is a section between stop signs I drive frequently. I do one pulse & glide for the whole section (~0.5 mi). When it's warm outside I only need to pulse up to ~30 mph to be able to coast the whole way. When it's really cold, it can take a pulse of ~40 mph to make it the same distance.

I watch my tire pressure and keep them pretty constant regardless of temperature, so I think I've cancelled out that effect. Also, I'm talking about low vehicle speeds so aero should be affecting things much.

Anyone ever seen hard data on this subject?