 1)We don't get the fuel economy we had hoped.We do a lot of driving on rural roads and highways, so speeds or 45 to 80 are the normal range, and we average about 25.5 mpg long term.Even on the rare occasions when we use an entire tank of fuel while driving in the city at 35 mph or less we only get around 28 mpg or so.2) We installed a trailer hitch, which was easy to do and cost less than $250.Around $150 for the hitch online, and $75 or so for the wiring jumper from Toyota.The Highlander Hybrid pulls a 3500 lb mgw trailer very well, even when fully loaded, but the fuel economy drops to around 15 mpg with the trailer.3) We purchased an special treatment for the cloth seats, since we have kids, and it doesn't seem to have helped at all.The seats stain pretty easily, and we are to far from the dealer to bring it in for cleaning or to use the warranty we purchased.I wouldn't recommend it.We still like the cloth seats better than the leather seats, but we should have used the $500 buck or whatever we spent on the treatment to buy good seat covers.4) We also purchased the Diamon Glass treatment.It didn't keep us from getting rock chips, although we did use the warranty to repair a couple of them. We have learned that most full coverage insurance will cover windshield repair anyway, so we could have saved the money on that treatment also.It also doesn't keep the water off any better than a good Rain-X treatment.5) We were mystified by one electrical problem a year or so ago in which we started to experience a delay in the starting of the Hybrid System when you turned the key to start.At the same time we noticed we could not leave a door open, or a light on in the car for more than a few minutes with the car turned off, or the battery would die and the car wouldn't start.We lived with this for about a year, just being careful to not allow the battery to drain, and occaisionally having to use a jump battery(which I always carry for emergencies) to start it.The I finally decided to test the car battery, and found it going bad so we replaced it.the Hybrid is back to working like new now.