AAA warns E15 gas might damage older cars

AAA said a new type of gas blend called E15 gasoline could be bad for some cars and will confuse customers.

It contains up to 15 percent ethanol. Auto-makers have approved fewer than 5 percent of vehicles to use it.

AAA said sustained use could damage vehicles by accelerating engine wear. This could void warranties.

The environmental protection agency approved E15's sale in June.