BMW won't yet be bringing its engine start/stop system, which is offered in other markets and saves fuel at stoplights, to the U.S., however.
At 17 mpg city, 24 highway, last year's X3 model was far from a segment leader. Yet the introduction of the new eight-speed—two more than last year—automatic transmission allows a wider span of gears and an even taller highway cruising ratio. That, and the new-generation engines, should aid fuel economy, so we expect 2011 ratings to be no lower, possibly a mile per gallon higher. And don't expect the more powerful xDrive35i to be any worse on fuel; in BMW's other vehicles it's proven to be just as fuel-efficient, if not better, than the non-turbo six.