I have a 2007 Yukon. My cruise increases from 3 to 7 miles per hour depending on the slope of the decline. I have taken it to the dealer and they said that was in normal range. I have had a 2002 Tahoe that never had that issue as well as I rent veihcals of all kind with out having to break on every decline to avoid speeding. Has anyone else experienced this and has any dealership repaired the problem?