The performance of the new Aston Martin DB4 in going from rest to 100 m.p.h. and again coming to rest in the space of 27.2 seconds, officially timed at M.I.R.A., is notable. But. we wonder who thought-up this convincing demonstration of its very effective acceleration-cum-deceleration? Last August, in a road-test report on the Facel Vega, Motor Sport timed this car to go from 0-100-0 m.p.h. in just over 30 seconds, and as severe brake-fade was experienced on this particular car, the acceleration of the Facel Vega shows up to advantage.