Eric Smit
Enforcer
Upgrade your tires. The tires that come with the Sonic are notoriously poor for winter use. Check tirerack.com for reviews on the current set, as well as plenty of recommendations/reviews for upgrades. Many of the better tires can be found locally (even Walmart) so you don't have to order from tirerack. I upgraded to the General tires at 5,000 miles, resold my old set for $160. Very glad I did!
the stock tires are hilarious poor in any conditions. ;P
-Eric Smit