BMW estimates a 7.8-second 0-60 mph run for the 3.0si, and a very respectable 6.4 seconds for the 4.8i, with top speeds maxing out at 130 and 150 mph, respectively. Not bad for a rig that tows up to 6,000 pounds and weighs about two and a half tons. That portly figure is part of the reason the X5 wears capable disc brakes (larger and vented for 2007) which are upsized about 15mm for the 4.8i. They're backed by ABS, electronic brake distribution and brake assistance systems, as well as all of BMW's leading edge brake technology – cornering brake control, brake fade compensation, brake standby, and brake drying.