This is my second Prius and I have totally satisfied with both vehicles. No problems of any sort (except one flat tire which was the fault of a big bolt left in the road). Most of my driving in this car is local, less than 4 or 5 miles per trip. However, I drove to Chicago (avg 56 mpg) and to New Jersey (avg 54 mpg). There have been no shakes, no noises, no problems. The quality of these cars is impressive by itself, but the clean emissions make it outstanding.