If Mayor Bloomberg wants to follow his own advice on salt, he’d better skip his favorite Subway sub.

The mayor lauded Subway along with 20 other food manufacturers yesterday for meeting voluntary salt-reduction targets last year in an initiative to cut sodium intake 20 percent nationwide by 2014.

Subway has cut 27 percent of the sodium from the “B.M.T.”

“I love Subways,” the mayor declared. “I’m glad the B.M.T.’s salt content is down, but I was eating them before and I’ll continue to eat ’em . . .”

But the B.M.T. is loaded with 1,300 mg of sodium, more than 85 percent of the FDA’s suggested 1,500 mg a day.