41. Few people have sharply cut back on their driving or have begun shopping for cars based primarily on fuel efficiency. 42. For years the gas-guzzlers have escaped strict federal standards determining the fuel efficiency of sedans, and enjoyed a more lenient standard of their own. 43. Given reasoned measures to increase automotive fuel efficiency, the Senate rejected it. 44. GM in particular had been counting on diesels to improve fuel efficiency and reduce emissions of so-called greenhouse gases. 45. Fuel efficiency is determined by the lift-to-drag ratio at cruising speed, he said. 46. He said the new engine combined the fuel efficiency of diesel power plants with the power and relative cleanliness of gasoline engines. 47. Heavy materials also boost vehicle weight, which reduces fuel efficiency. 48. Higher fuel efficiency is possible. 49. Higher fuel efficiency. 50. If air could flow freely into the cylinders, fuel efficiency would improve. |