It didn't seem possible that politicians could think up a sillier energy proposal than Barack Obama's windfall profits tax on oil companies, but Republican Sen. John Warner of Virginia has done just that.

Earlier this month, Mr. Warner suggested a return to the federal 55-mile-per-hour speed limit on America's highways, as a way to save on national gasoline consumption. "I drive over 55 miles an hour, . . . sometimes 65," he said on the Senate floor. "But I am willing to give up whatever advantage to me to drive at those speeds...