I would tell them its a big purchase for you, and that you normally drive your potential cars around your regular route to get an adequate fell of the entire car's characteristics.
Take it home, drive it to work and back, to the grocery store, etc. Honestly its a rather large purchase, a 5 minute 2 mile test drive isn't adequate for a 75k+ car. Acceleration from your stop lights, cornering around your streets.
I've found its more than adequate, certainly no slouch. Just definitely wouldn't win any stoplight races. Its ~400lbs lighter than the 750, but down 120hp from the V8. I personally aren't in love with the exhaust note, nothing bad, just always have grown up around V8s and this is my first non-8 Cylinder vehicle.
2016 750i xDrive M-Sport (Current)
2015 650i Coupe
2013 750i M-Sport
Last edited by ChrisF01; 02-18-2013 at 01:06 AM.