Achates engine in Ford F-150 pickup targets 37 mpg, with Saudi oil company backing

Achates 2.7-liter opposed-piston gasoline compression-igntion engine in Ford F-150 test pickup truckOne year ago at the Detroit auto show, a company called Achates Power unveiled models of a new kind of internal-combustion engine. With opposed pistons in the middle and crankshafts at either end, it was sufficiently different to startle most visitors who paid attention. That engine came with some audacious claims, too: How about an EPA combined...