The new designed Nissan Sentra is poised to set new standards in its segment—starting with a best-in-class combined fuel-economy rating of 34 mpg.In addition to its roomy dimensions—which include 37.4 inches of rear legroom even with the front seats pulled all the way back—the cabin boasts standard soft-touch accents, power windows/locks, air conditioning (with filter), and even a rear-seat armrest with cupholders.