2014 Mercedes-Benz B-Class Electric Drive

Mercedes-Benz B-Class drives well, but not far, on Tesla power train

Gradual acceleration, maintaining steady speeds under 40 mph, and carefully planned regenerative braking all help maximize range in electric vehicles. When I got behind the wheel of the 2014 Mercedes-Benz B-Class Electric Drive, I didn't practice any of those strategies.

Instead, I hammered it along a twisty mountain road and ended up with a dismal Eco score, according to the car, of 29 out of 100.

I put my inefficient driving down to both the car's responsive electric drivetrain, built by Tesla, and the route Mercedes-Benz chose for this press introduction of its all-new electric car. Most of the 52-mile drive was on a 65-mph freeway and a mountain highway with a steep ascent.

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