I don't really see a big difference at all Yes, its not the same as a V8 but then again the mileage of a V8 is terrible. My 18 year old son thinks its great as he loves the sound of the engine off the line. Its worth the sacrifice of a gas guzzling V8 not to add the cost saved!!! I will agree with you about the GX 470 lift gate. Absolutely HATED it. Very hard to handle as it never stayed opened and VERY heavy. But the ride was unbelievable (especially on the highway), nothing like the 4 runner. The X5 gives you the feel of being in an SUV with all the extra added height of the car and is so much fun to drive. Not quite as smooth but much better performance and handling, especially in turns. You can't go wrong with the X5 !!!