Has anyone else noticed this?

I was curious of any of you guys could explain to me how Motor Trend turned better 0-60 and better 1/4 mile times with the 330XI than with the 330I. The numbers were 5.8/14.4 and 6.1/14.6 respectively. How is this possible? The XI weighs more and its not like the 330I has wheel spin off the line due to excessive power or anything. So I ask everyone, what is up with this? BTW, MT isn't the only mag that has turned better times in the AWD model versus the RWD.

The XI has better traction with all 4's grabbing so it gives just that slight bit of advantage on launching which turns better times.