Porsche thinks its synthetic gasoline, which it calls E-Fuel, could be as clean as an electric vehicle. First, it needs to prove that theory, and that starts this year. In fact, it starts today. The German company on Tuesday said drivers and their vehicles participating in the Porsche Mobil 1 Supercup race series will be topped off with the renewable E-Fuel. The series kicks off today in Zandvoort, Netherlands, and the fuel will power the race cars through the whole season to test its performance and efficiency. Porsche expects this first iteration of the E-Fuel to burn with 85% fewer...