FOXBOROUGH — The Patriots’ top-ranked offense has owed much of its success to efficiency on third down, a league-leading 53.2 percent (83 of 156).

“I think, ultimately, it comes down to execution,’’ coach Bill Belichick said Friday. “Some of that, of course, is the situation that you’re in. Nobody in the league is converting 50 percent of [10-plus yards]. You put yourself in enough long-yardage situations, you won’t convert them.