How UPS Reduces Fuel Consumption

By minimizing left-turns!

You wouldn't think of something as benign as avoiding a left-hand turn could conserve fuel, but Atlanta-based United Parcel Service (UPS) swears by it. In fact, the parcel carrier has technology in its systems that help map this out routes that minimize the number of left turns the driver has to make.

I wonder if the USPS has followed suit?