Porsche has announced that dealers the world over have begun taking orders for the company’s 918 Spyder. The plug-in hybrid will boast a 500-horsepower, 4.0-liter V8 engine and two electric motors capable of a combined 218 horsepower. Porsche says the hybrid powertrain will consume a mere 3.0 liters of fuel per 100 kilometers – or around 78 mpg. The German automaker hasn’t released any fuel economy estimates based on U.S. testing standards, though...