The new 2013 Nissan Sentra is an economy that grew one size bigger. In fact Nissan will tell you that the new 2013 Sentra has the most leg room of any car in it's class. It also gets 30 MPG in the City and 39 MPG on the highway according to the EPA. Those are very impressive numbers for a car that will easily carry four adults and their stuff in comfort. But big and fuel efficient usually also means slow, especially at one mile above sea level.