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Old 10-26-2012, 01:30 PM   #3 (permalink)
JRMichler
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Join Date: Feb 2011
Location: Phillips, WI
Posts: 1,013

Nameless - '06 GMC Canyon
90 day: 37.45 mpg (US)

22 Maverick - '22 Ford Maverick XL
90 day: 41.9 mpg (US)
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You would save the friction of the center support bearing. Almost zero overall benefit.

A one piece drive shaft needs to be designed to have the critical speed well above the fastest RPM it will ever see. The diameter gets large enough that the two piece is a better design overall.

You DO NOT want to find the critical speed of a drive shaft while driving.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.

22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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