I bought my Avalon used in 2002. So far the only maintenance problem I've had is that the check engine refuses to go out. I've a few mechanics look at it, and no one can seem to find the problem. Other than that, it has been an excellent vehicle. Strong engine, with OK mileage.
Strong engine. Toyota build quality, very comfortable ride, reliability.
Improved mileage, I'm averaging about 21 in city driving.