Look at the highway fuel numbers of the newest hybrids and diesel vehicles. The Toyota Prius gets about 50 mpg during highway driving and the Chevrolet Cruze diesel is rated at 46.
However, the Cruze Diesel is also an excellent companion on the highway thanks to improved sound deadening, borrowed from the Buick Verano. If you’re spending a lot of time on the highway getting to and from work, a diesel powered vehicle will work wonderfully. Diesel-powered cars also tend to return reliably better fuel economy ranging over a variety of driving styles.