Driveline Component Efficiency

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MolaKule

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According to the latest EPA report (EPA-420-R-20-006) automotive tribologists' have contributed to significant and improved mileage gains. .

Even as engine horsepower verses displacement have increased, fuel consumption has decreased.

Another driveline component that has contributed to increased efficiency is due to the increased number of forward - - - - -.

Please fill in the blanks AND tell us which driveline component is being discussed.

Open to all interested in responding. This QOTD will be left open for three days for on-topic responses.
 
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____ - sales of new vehicles when it becomes cost prohibitive to repair because the additional gears make them more prone to repeat failure.
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Gears! The number of forward gears have increased and shift points have been optimized for the best fuel economy.
 
Speeds in the transmission.

There have been other transmission improvements such as improved torque converter lockup, dual clutch, more rolling element bearings, and smaller more efficient hydraulics.

Rod
 
gears ?

Many cars and trucks have 7, 8, and 10 speed automatic transmissions which allow the engine to operate in a more efficient RPM range than the old 3 and 4 speed automatics.
 
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