Mercedes sold 10 of its S-class plug-in hybrid in the U.S. in July according to InsideEVs. First New EV For US In 2015 Finally Arrives: Mercedes Delivers The S550 Plug-In This car has all of a 8.7 kWh battery giving a whopping 18 miles of electric range. So basically it's a fancy PiP. For all the venom directed at Tesla buyers getting the $7500 EV tax credit, why does no one mention that buyers of this Mercedes get more than half that amount for buying a car that will do almost nothing but occupy EV charging spaces in place of EVs which need them? I was amazed to find how little battery it takes to qualify for most of the federal tax credit. The base is $2500, then it's $417 per kWh up to a maximum of 16kWh, or a total of $7500. The Mercedes S-class gets a federal tax credit of $4700, or more than half of the credit that a Tesla gets with batteries almost 10X as large that can actually get you somewhere. For the conspiracy theorists out there, the 16 kWh battery size for qualifying for the full $7500 credit just happens to be the battery size of the first GM Volt.