When I test drive the GT and GTR the main difference was drivability. The GT was louder and less refined. We went with the GTR. Couldn't be happier. Bought the vehicle in Evert Washington and got 29.1 mpg on I-5 on the way home. We are getting 23-24 mpg with mixed driving. 1,600 plus miles as of now. Finest vehicle I've ever owned. You will never be disappointed with the GTR.