If you're in the market for a new set of wheels, you might be surprised to find out that your spiffy new car may not have spare tire - and instead be equipped with a sealant kit. In 2010 the U.S. Department of Transportation required new vehicles to meet certain fuel efficiency standards. In order to meet the new mandate, some car makers are doing away with traditional spare tires and the corresponding tools to bring the car's overall weight down. Tara Hanley of AAA MountainWest noted, "Our first concern was that motorists were aware of it and that they...