I'm considering purchasing an XC90, either FWD or AWD. Aside from the fact that AWD will be better in snowy weather, are there any other advantages of an AWD model vs. an FWD model? Does DSTC and roll-over stability work equally as well with the FWD as it does with the AWD? (Do these systems rely on AWD?)<p>Thanks<p>Also,<br> Is fuel economy any better on a FWD model?