Welcome to Car and Driver's Testing Hub, where we zoom in on the test numbers. We've been pushing vehicles to their limits since 1956 to provide objective data to bolster our subjective impressions (you can see how we test here). Plug-in hybrids have an advantage over electric vehicles: When their batteries run dry, their internal-combustion engines can complete the rest of the journey. However, for folks who want a PHEV with more than 40 miles of electric-only range, there are just a handful to choose from, and the new-for-2023 Mercedes-Benz S580e is one of them. It also recorded the longest real-world electric range of any plug-in hybrid we've ever tested on our 75-mph high