Luxury plug-in SUVs promise a lot: silent electric commuting during the week, long-distance road-trip capability on the weekend, and the prestige of a premium badge every time you open the garage door ...

It was over a decade ago that plug-in hybrid vehicles started to gain traction here in the U.S., but only in recent years have we seen a real flurry of new PHEVs enter the market from most brands, ...