We just picked up our new Rx 400h last week and LOVE it. That is until I drove it on a short highway trip. During which I noticed what I can only describe as "small suges" in the speed. It is almost as if you have your foot on the gas and you are ever so slighly moving your foot up and down very quickly. I at first thought it was my imagination and said nothing. The next day my wife came to me and asked me if it felt like the car was "jerking" on the highway.

I then let my brother drive it. Without telling him a thing he too noticed it. It only happens at speeds over 50mph and never with the cruise control on. I took it to the dealer and I think they thought I was crazy. They had a non-hybrid trained mechanic drive with me and he blew it off to the "nature of the hybrid" which I did not accept. They then had a hybrid trained engineer look at it and low and behold he too agreed something was "not right". He then contacted Lexus who told him this was not the first complaint on this issue. They asked to keep my vehicle for a "few days" while they fly an engineer out from Atlanta with some specific equipement to look at it first hand. In the meantime my shiny new Rx sits on the dealer lot while I drive around a new but very boring Es300 loaner car.

So, has anyone else experienced this? If not, please take your Rx400 out on the highway and see if you notice it too. I am anxiuos to find out if this is a problem with all the 400s or just a few of them!