Thanks to a new, more economical four-cylinder engine introduced to the lineup last year, the BMW 5-Series is now one of the greenest picks among mid-size sport sedans. Its EPA ratings, of up to 22 mpg city, 34 highway, with the eight-speed automatic, stand out and even compare to the ratings of some far less exciting models.
On the 535i, gas mileage ranges from 20-21 mpg city to 30-31 mpg highway, depending on the transmission.
And beginning with the introduction of a new-generation twin-turbo V-8 in the 550i, these models are much-improved for 2013, with the 550i gaining up to 5 mpg on the highway, for tatings that range up to 17/25 for the 550i and 16/24 for the 550i Gran Turismo.
In general, Gran Turismo models do lose some mileage, due to additional weight and less effective aerodynamics, but you might find the tradeoff in additional practicality worth it.