 By mid-2008, there were approximately seven million E85-compatible vehicles on U.S. roads.However, a 2005 survey found that 68% of American flex-fuel car owners were not aware they owned an E85 flex.This is due to the fact that the exterior of flex and non-flex vehicles look exactly the same; there is no sale price difference between them; the lack of consumer's awareness about E85s; and also the decision of American automakers of not putting any kind of exterior labeling, so buyers can be aware they are getting an E85 vehicle.