hybrid was the most popular car in our long-term fleet during its 12-month tenure. we factor out all the miles we accumulated on our "winter" tires, we probably would have averaged 32 mpg. But such is the life of a C/D long-term car. We put winter in quotes above because instead of ordering Blizzaks or Hakkapeliittas, we tried a set of Michelin CrossClimate 2s. This isn't your typical winter tire in that it's designed to be used year-round, but it still meets the traction requirements for a Three-Peak Mountain Snowflake designation. We had them on for about 15,000 miles, keeping them well into spring. We estimate they will last 70,000 miles. We didn't test the car on them in dry conditions, but drivers commented on how well the Sienna behaved on them. The typical winter tire has lots of squirm that a sensitive driver can detect, but not these. If that's enough for you to eliminate the biannual chore of swapping tires, these tires are a strong option.