Engine Downspeeding Dictates Drive-Axle Design
To slow the speed of the engine at cruise — called downspeeding, in which every 100 rpm slowed equates to 1% fuel savings — axle ratios are getting numerically lower. To wring the most miles from a gallon of fuel, some fleets are increasingly spec’ing direct-drive instead of overdrive transmissions, which is driving the trend to lower numerical final drive ratios....
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