HybridsVsDiesels

Readers of London's Sunday Times kept telling the auto reporters that the official mileage numbers for the Prius were overstated by about 15 imperial mpg. Intrigued, the Times decided to test things out by running a Prius against a BMW 520d with regenerative braking from London to Geneva, a 460-mile trip. Then they added 100 miles of urban running to give the Prius a chance to recover ground on its proper turf.