I would say go for the diesel if: you want amazing acceleration at any speed(I accidentally took my x5d from 55 to 90 in around 1.8 seconds..got a speeding ticket for that), and better gas mileage(as you said), also if you don't mind using dirty diesel nozzels at he pump
Go for the petrol on the other hand if you want: an x5 that revs more than 5500 rpm(redline), and you want the deep sound of gasoline rather than the ticking of diesel(you can't hear the diesel ticking inside the cabin but outside it's pretty noticeable), the petrol will not accelerate as fast as the diesel though
"Time flies like an arrow. Fruit flies like a banana."
Last edited by Bimmerx53; 10-28-2011 at 12:51 PM.
Reason: Remembered a few more things about the diesel