The 48V system was the last instructor-led training course I took before I retired. It's a really cool setup but really just a stop-gap measure. MB went as far as they could with a 12V/250A system. The first thing I noticed was how seamless the ECO Start/Stop system works. The engine cranking speed of the 48V motor is only slightly below idle speed so you'll hardly notice the frequent shutdown/startup when creeping along in bumper-to-bumper traffic...