Don't Top Off the Tank!

From NYLINE:

If you have ever wondered why topping off your vehicle's tank at a self-service gas station is a problem, the New York State Environmental Facilities Corporation (NYSEFC) explains it in some detail on Pages 5-6 of the newsletter Clean Air News: Stage II Vapor Recovery Systems - Performance Testing (PDF).

This 'Gasoline Stations' newsletter from 2003 can be found among other related topics here.