BMW has made such progress with fuel efficiency in just a few model years; and for 2014, the 5-Series does even better—with new, more fuel-efficient turbocharged V-8 engines in the 550i models, as well as, more importantly for green shoppers, the new 535d diesel model.
With the 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.
At the middle of the lineup, the 535i is a good compromise for those who want more performance but don't have much tolerance for a guzzler.
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.
Throughout the lineup, on gasoline models, you get Auto Start/Stop technology, which smartly shuts off the engine at stoplights. And on all models, there's Brake Energy Regeneration and other fuel-saving technologies.