It may not be the first time Porsche's 918 plug-in hybrid has had a chance to flex its 770 horse power for the camera, but when we last saw the pricey insanely expensive speed demon strut its stuff on record, it certainly didn't look like this. The freakish prototype has emerged as a beautiful, high-performance vision of efficiency, blasting its way past 100 kilometers of terrain for every three liters of petrol (78 miles/gallon). The $845,000 machine pairs a combustio