 However, this greatly aided the strategic, logistical, and tactical flexibility and mobility of all Allied armored forces using the Sherman.A long-distance service trial conducted in Britain in 1943 compared diesel and gasoline Shermans to Cromwell tanks (Rolls-Royce Meteor engine) and Centaur (Liberty L-12).The British officer commanding the trial concluded "They are utterly reliable...I do not think they are quite as good as the Cromwell across country when they are running on rather worn rubber tracks and the going is greasy, neither does one get as smooth a ride, but they appear so infinitely superior in every other way particularly in reliability with a minimum of maintenance that this cross-country consideration is completely overweighed."