It stirs me up a bit when I see the compressor sales companies using deceptive advertising, calling a 3 HP motor a 6.5. The CFM's is listed on some small barely visible tag. They probably get by with it because it's a CALCULATED 6.5.
I got burned by Craftsman years ago, buying a new table saw that was advertised as 3HP but was really a 1.5 HP. Craftsman lost my business for power tools after that. Jim