I have had my X-5 diesel for almost two weeks and it is a great car. Having driven the Mercedes diesel for the last year this car is head and shoulders above the GL 320 but mechanically and technically. The acceleration is great and the car sounds just like a gas version from the inside. There is diesel clatter outside the car but inside is no different from another X-5. I have just over 500 miles on the car and it is hard to keep below the 3500 rpm for break in purposes. I think this car will kill the 4.8 for the price and the performance. It is only slower 0-60 by 1/2 second and costs about $3K less. So far I am averaging 21 MPG in city driving but have not taken it on a highway trip yet. So far this is the perfect SUV for cargo capacity, fun to drive and excellent mileage.