AUTOS: Heavyweight Champions

The heaviest and costliest car, driven by the youngest driver, scored an upset victory in the 1956 Mobilgas Economy Run last week. At the end of the four-day, 1,468-mile course from Los Angeles to Colorado Springs, the trophy for the best gas mileage, won by lightweight Studebakers the last two years, went to a 4,580-lb., Chrysler Imperial Southampton (list: $5,618), piloted by 26-year-old Mel Alsbury Jr., of Hollywood.

Pound for pound, the Imperial used less gas than any of the other 20 cars, averaging 61.37 ton miles per gallon (computed by multiplying the...