Originally Posted by +fireamx

Nick, the Dec. 2003 issue of Motor Trend did a comparison road test of a 2003 SLK vs the 2004 Crossfire. The Crossfire is 70 lbs. lighter.
The mechanical specifications for both cars were identical, and yet the automatic equipped Mercedes out performed the automatic XF in the 1/4 mile with a 14.84 to 15.18 sec. difference.
Essentially the magazine went on to say that the slower acceleration of the Crossfire was attributed to it's massive rear tire's creating more rotating inertia, which of course takes more H.P. to get moving.