Motorists may find that some new vehicles do not come with spare tires, auto safety advocates recently noted, as manufacturers attempt to comply with government fuel efficiency standards.

Instead of heavy spare tires, some are equipping vehicles with sealant and inflator kits, or choosing tires that can go a significant distance without air. Many drivers may not realize they have no spare tire until they need one, safety advocates warn.

To avoid that problem, they suggest checking the vehicle inventory, the owner's manual and learning what alternatives they may have so that they will not be surprised in an emergency. Current fuel efficiency standards are scheduled to last from this year until 2016. For those using inflator and sealant kits, advocates note, it is important to check the age of the sealant and replace it when necessary.

Some auto insurance providers may also include roadside assistance services to consumers, though these may have limited range or circumstances. Drivers should ensure they know their options in an emergency. Wise preparations may include reviewing the use of sealant and inflator kits and checking tires regularly or before long trips.