Regarding the radio ads, don't forget the fine print that's being read at double speed is also being broadcast at half the volume, if that.

Back to the subject at hand, the first ad clearly has issues, but the "up to" is ambiguous enough to avoid any real legal issues the 2nd time around. As several others have noted, you must beware when those words are used in a discount. I think a common sense rule would be to require a certain % of products/brands/etc. to be discounted at the "bold print" advertised rate. That would likely require Lowe's to reword this ad as "10-20%" instead of "up to 20%"