I can accept what you're saying about heat as true, but I don't think you're addressing the issue of repeated acceleration and deceleration as it relates to speed bumps. Some amount of extra tire wear will occur due to the extra forces involved in acceleration and deceleration, regardless of the temperature of the rubber.

I agree that slower speeds are better for fuel economy due to the wind resistance issue, but that's very different from saying that a road with speed bumps is better for fuel economy when many of the drivers will be accelerating and braking between each bump, instead of traveling at a constant speed.