I learned to drive in a 1985 Volvo 240. The Nordic boxcar's 2.3-liter four-cylinder engine deployed one hundred and fourteen horsepower against three thousand pounds of Swedish steel. For reasons best left to Roswell conspiracy theorists, the feds recently re-calculated the 240’s mpg: 19/26 (coincidentally the age of the average 240 driver).  That’s not bad for rust, but let’s face it: a used 240 is hardly a Prius driver’s second choice. Even so, the humble Volvo recently inspired an automotive epiphany that could lead to The Mother of All Environmentally Friendly Automobiles.