Show diagonal tire rotation Is tested to even wear ames iowa diagonal rotation will aid materially in increasing the life of automobile tires according to discoveries made by professor R A moyer iowa state college high way engineer professor moyer has found that wear on the right rear tire is al most three times as great as that of the s left front tire he recommends rotation every 3 or 5 miles to assure more uniform tread wear untreated gravel roads were found to require 10 per cent more gasoline output from an automobile than concrete and other high type surfaces the high type surfaces also insure a maximum of safety against studding ding and a minimum of tire wear oil consumption increases rapidly as speed is increased moyer and his assistant H W discovered on a test car used it was found that fl five ve times as much oil was used at fifty two miles an hour as at thirty three miles an hour |