I know a lot of people have done the swap from 21" to 19" for the winter, but I wanted to give folks my thoughts after doing the swap yesterday, having spent 6 weeks driving in the cold/rain on the 21" tires. Efficiency: I don't know what the exact specs for rolling resistance are, and how they might be different in the rain, but I can without a doubt say that I'm already seeing much better range. At least 10% but in places, it seems like even more. I've never taken a trip and gotten less than 300Wh/mi (usually around 360), and the first 10 miles on these tires were at 290. Handling: I'm very sensitive to the handling of this car in the rain, the traction control and ABS do a wonderful job of keeping the car stable in not so stable conditions. After I had about 30 miles on the 19" tires, I hit a freeway ramp that I hit every day in the 21" and even in the rain I felt like I was completely stuck to the road. The grip was far and away better in the wet (temps hovering around 40º) than the 21". I actually feel like I can relax a little bit and I didn't even know I was tense! Looks: 1 hour trip back from the service center, two thumbs up and one honk. Yep, these tires/wheels don't make my car look like a [insert your typical family sedan here]. Bottom line, I'm very pleased that I made the swap even though the winter days are waning, the truth is it won't really stop constantly raining up here for a few months anyway, so I'm going to get plenty of use out of them. Also, whenever I run through my current 21" I'm going to look for a set that performs better in the rain. I'm not very impressed with the Continentals. I don't think I realized how bad they were until I got these tires.