From fast to efficient, the BMW Z4's engine range offers more choice than most roadsters for those concerned about gas mileage.Using its turbo-4, the base Z4 scores 22 mpg city, 34 highway, 26 combined with the stick shift. Opt for the automatic and it shaves 1 mpg off of the highway rating, leaving the others untouched
With more power comes somewhat poorer gas mileage: the sDrive35i rates 19/26/21 mpg city/highway/combined with the manual transmission. Pick the dual-clutch seven-speed gearbox and those numbers fall to 17/24/20 mpg.
The sportiest model, the Z4 sDrive35is, also scores 17/24/20 mpg city/highway/combined.
Those aiming to save some cash at the gas pump with their roadster should choose the Z4 sDrive28i; in our hands, its real-world fuel economy can exceed the EPA rating.