My neighborhood is home to a typical New England mix of vehicles. There are older Volvos, a few SUVs, a couple of pickup trucks, some run-of-the-mill sedans and a smattering of collector’s cars like an antique MG a neighbor parks on the street in the summer months. But there is one car that catches my eye more than any other. About a block away, neighbors have a compressed natural gas-fueled Honda Civic. I know it’s a natural gas version (the Civic GX) because it’s emblazoned with NGV lettering on the side and when I walk past their house I...