once a simple, un uming hatchback, the 2017 volkswagen golf line has grown to include an all-electric e-golf, two high-performance trims (gti and r) and a wagon. although the fuel-economy champ tdi diesel is no longer offered, the golf tsi’s standard 1.8-liter turbocharged gasoline engine returns highway fuel economy in the 35-mpg range and is a rather peppy performer.