Congrats, and glad you are enjoying your Diesel. BMW and MBZ make amazing diesel engines!

I have read on other forums about people saying (expecailly on the X5) that if they push the tip of the gas pedal...the car is smoother, faster, shifts better.

I do not understand how on earth that can matter. Whether you push the gas pedal at the tip, or at the base....it's the gas pedal. I would love a logical (and real) explanation how this can matter. It baffles me, honestly!!