Also post on the 1st Generation Highlander Hybrid forum further down the page.
I would say stay away if you are planning to buy older used Hybrid Highlanders just for MPG. you never know when the Hybrid battery goes out, new one cost anywhere between $4k to $6k to replace. refurbished cost about $3k. also they have ABS actuator issue, if you are out of warranty and that goes out , its a $3K parts and labor. Hybrids won't give good MPG if its cold outside and short trips. I can go on and on...Currently have a 2002 v6 and like it alot but 18mpg is not good for me I'm going through 2 or 3 tanks a week for work. I'd like to get a 3.3 hybrid soon.
What are the common failures of the hybrid system and how do I know what condition the battery is in? How much are the batteries if it does need to be replaced?
I've never had a hybrid anything in my past and would like to get an idea of what I would be getting into!