It's a natural enough progression: instead of one element turning a bit of the air upwards before it smacks the tire, they're using several elements moving more of the air up to hit the tire less badly.
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Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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