I did not invent the term "coal-powered cars" but I have used it consistently. It appears others, like
Forbes.com are
coming on board.
Honda’s natural gas powered Civic GX is currently only available in California and three other states.
The decision to expand marketing efforts nationwide reflects the growing demand for environmentally-friendly cars in mainstream U.S. markets.
Natural-gas-powered vehicles are expected to compete with electric vehicles, especially to the extent the latter rely on electricity produced by coal-burning power plants.
Yup: coal-powered cars.