With the cruise control on and starting up a hill it will drop a couple gears and snap your neck. It is a real pain in the ass and very annoying. I know the mileage is taking a dive. It's like it goes into passing gear. I drove in the rain last weekend and it felt like the rear tires spun at 60mph when this happened. Dangerous! Called Toyota service and they said there was no fix and recommended I call dealer. I called dealer they said there was no problem. WTF