At 3 a.m. one morning last week, 32 new cars began to roll out of Los Angeles on the first leg of a trip which twisted up the slopes of snow-capped mountains and along parched desert highways to the rim of the Grand Canyon. Purpose of the trip: to find out which U.S. cars get the most mileage and efficiency from their fuel. Every major U.S. make, except Buick, Oldsmobile and Pontiac, was represented. At journey's end, about 21 driving hours later, the cars had traveled from 280 feet below sea level...
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