41.   They recharge their own batteries while running at highway speed on their gasoline engines.

42.   This shows up at highway speeds, where passing and hill-climbing oomph could use improvement.

43.   Tighter, stiffer steering at highway speeds makes for surer control.

44.   Top down, the driver and passengers will find the well-designed convertible to be relatively free of wind buffeting, even at highway speeds.

45.   Wind noise at highway speeds was surprisingly low for a large car with a generous silhouette.

46.   Ford said half the increase will come from more efficient engines, which will use such tricks as shutting off some cylinders at highway speeds and variable engine timing.

47.   NHTSA also began a preliminary investigation into some Firestone tires after some consumers complained that the tire tread can separate while driving at highway speeds.

48.   The positive crankcase ventilation system of the engine may freeze when operated in extremely cold weather for extended periods at sustained highway speeds, Ford said.