2,500 rpm in a family sedan generally isn’t a whole lot to get excited about. In fact, it’s traditionally closer to idle speed than anything offering the possibility of real entertainment. But each and every one of those 2,500 revolutions in this 2013 Nissan Altima offers a frisson of excitement when whirling away in concert. Why? Because they add up to 100 mph. In a four cylinder. Funk Flex