I own a 2008 Avalon with 38000mis and the battery had to be replaced last week when the car would not start at a rest stop on the freeway. The car has seldom been exposed to harsh climates and the battery has never been totally discharged. Toyota waranty expired at 36000mis and they would not prorate. Went to Wallmart and bought a battery which was 40%cheaper than Toyota. Wallmart battery has three year total replacement plus another 6 years prorated. I have owned many new cars and this is the first one that has failed me after 2 years and nine months.