51.   If automakers focused more on fuel efficiency and less on horsepower, they could easily meet higher CAFE standards, he said.

52.   If the standards were raised, manufacturers would have to increase the fuel efficiency of their fleet.

53.   If they attract customers who might otherwise buy big sport utility vehicles, then the net effect would probably be to improve fuel efficiency slightly.

54.   Improving fuel efficiency depends largely on reducing weight, which comes at the expense of safety and comfort, he said.

55.   In addition, she said, the new technologies are expected to increase the fuel efficiency of trucks.

56.   In a report released Wednesday, the council lauds the fuel efficiency, and thus environmental cleanliness, of the Honda Civic and Mitsubishi Mirage.

57.   In Japan, vehicles increasingly use an engine valve technology that improves fuel efficiency but tends to hurt acceleration.

58.   In terms of environmental impact and fuel efficiency, its advantages over gasoline substantially outweigh its few disadvantages.

59.   Increased fuel efficiency, you recall, would result in American motorists burning far less fuel.

60.   It requires automakers to meet specific standards of fuel efficiency in their vehicle fleets.