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This oil-less centrifugal compressor uses a variable speed drive and magnetic bearings to make it more efficient.
Roof racks are a drag. Most cars are reasonably streamlined, but you work against their slipperiness if you carry things on the roof. A loaded roof rack can decrease an SUV's fuel efficiency by 5 percent, and that of a more aerodynamic car by 15 percent or more. Even driving with empty ski racks wastes gas.


