Since the advent of hybrids and electric cars, debate has raged about their efficiency over a full lifecycle. Sure, they use less fuel when strapped to a government test rig, but do they create fewer CO2 emissions throughout their entire manufacture-to-recycle life? Mercedes handed an E350e to the German Technical Inspection Authority (TÜV Süd) to prove hybrid power is cleaner than gas in the long run.
The E350e absolutely blows a regular E-Class away on the testing rig, returning 2.1 l/100 km (112 mpg) on the New European Drive Cycle (NEDC). That’s close to half the 3.9 l/100km (60 mpg) used by the base model E220d on the same test, while the hybrid’s 49 g/km of CO2 is also significantly lower than the diesel can manage. The E350e can run on battery power for 33 km (21 mi) as well, which means it can run smoothly and silently through the city with no local emissions.
+Info and Source: https://goo.gl/tdUks0