Ever drive an X5 with either the 4.4 or 4.8? They are totally different animals from a 3.0. Try one and you will see and feel the difference.

Never tried a V8 E53. My mother's X6 35i is what I consider "fast" even if many cars on the road can keep up with it. I drove my father's 325xi once too and found much more pep in that than the X5.

It is possible that it would be more fun with a V8 X5 as I won't ever be lacking power again. Downshifting up an incline to keep a steady 75 MPH sucks! However, it would never be justifiable to move from an I6 E53 to a V8 E53 so I will keep using what I have.

Going to try some hypermiling this week with the X and see what happens. :)

I used to do a bit of hypermiling in my Hondas I've owned but never thought to try in the X. Might be entertaining on a "not in a hurry" road trip.. What psi are you guys running? 40? 45? Guessing weight savings in this beast is pointless...

PSI?

psi - imperial measurement for tire pressure

Ive done it, 300+ something KM, i hate miles and refuse to use them or inches or anything like that

Ahh... not sure, I always inflate to whatever it says on the door. I think it's 32 front and 35 rear, but I'd have to look. One mechanic I know says that you can give it 3-4 more safely, but not sure if he's off his rocker. ;)