Just to add to what Alex3917 said. I spoke to someone who had an older model Prius than I did. He had owned it for a while and said that he noticed a bit of fu

Just to add to what Alex3917 said. I spoke to someone who had an older model Prius than I did. He had owned it for a while and said that he noticed a bit of fuel economy decline, but that's it. But, like I said up there, I've had mine for over 3 years and it still gets 53 MPG. As I learn to drive it better and let go of the need to go really fast, I get better mileage as well.