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GREEN | 7 out of 10
24/34 mpg, 28 mpg combined (sDrive28i)
22/33 mpg, 26 mpg combined (xDrive28i)
18/27 mpg, 21 mpg combined (xDrive35i)
BMW is estimating about 24 mpg on the EPA city cycle and 33 on the highway with the four-cylinder and rear-wheel drive.
Car and Driver
BMW's own EPA estimates suggest the sDrive28i should achieve 28 mpg combined (25 mpg for the all-wheel-drive model) compared with 21 mpg for the xDrive35i.
the 8-speed can tolerate automatic start/stop -- which helps fuel economy in city traffic.
we're getting the Life Cycle Impulse (mid-cycle refresh) version, which brings styling tweaks, EfficientDynamics tech like smart-charging and auto stop/start, plus an Eco Pro setting. It coaxes more efficiency out of the car by trimming climate control energy and coaching thriftier driving skills
Despite its crossover styling, the X1 really functions more as a small wagon, and gets similar fuel economy ratings, too. In fact, two of the available models earn better than 25-mpg in combined conditions.
The X1 powered by BMW's turbocharged in-line six-cylinder isn't one of those models. It's rated at 18 miles per gallon city, and 27 miles per gallon highway, for a combined rating of 21 mpg. It doesn't offer stop/start; its six-speed automatic isn't designed to handle the mechanical stresses induced by the system.
The more efficient versions are the sDrive28i and xDrive28i models, which have the turbocharged four-cylinder engine. The rear-drive X1 gets 24 miles per gallon city, and 34 miles per gallon highway, the agency reports, with a combined rating of 28 mpg; with all-wheel drive, the turbo-four X1 is scored at 22/33 mpg and 26 mpg combined.
Four-cylinder models come equipped with an ECO PRO function and stop/start. ECO PRO maps the X1's throttle and eight-speed automatic transmission shift points, as well as its climate-control settings, to help with small, discrete gains in fuel economy. Stop/start offers more measurable differences, and although the system can be unexpectedly jarring at times, it's smoother than the one we've observed in BMW's six-cylinder-powered cars.
Both of the engines in the 2015 BMW X1 are fuel-efficient; although in the 35i, mileage drops precipitously when you give in to temptation.