The 2013 Ford Fusion, for instance, has a choice of four-cylinder gas engines getting 33 to 37 mpg on the highway, but will also be available as a hybrid and a plug-in hybrid.
Fuel economy ratings at or above 40 mpg on the highway is becoming common among small cars, with midsize models leveraging turbocharged four-cylinder engines to deliver V6-like acceleration with fairly frugal fuel economy.