The fuel-efficiency comeback of American auto makers -- they won the top spot in the last five years -- has been lost to the Japanese. According to the U.S. Environmental Protection Agency's Top 10 list of gas-savers, released today, the Honda Civic HB/VX offers the best deal on a gallon-of-gas-or-less commute with 47 m.p.g. city and a whopping 56 m.p.g. highway. The good ol' U.S.A., represented by General Motors' two Geo Metro models and Ford's Aspire, took the only three non-Japanese spots. BTW: Owners of the bottom 10 can afford the gas guzzling. Eight of the 10 worst mileage cars were Rolls Royces, and the bottom-feeder was the Lamborghini Diablo (9 m.p.g. city, 14 m.p.g. highway).