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Old 03-22-2014, 10:13 PM   #4
geezer#99
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Join Date: Aug 2009
Location: Bowser
Posts: 13,973
Re: Lower rpms

Save your money and your time and get your tach fixed.
At 65 mph you're turning 2400 rpm.
An overdrive tranny won't magicly give you more miles per gallon. Likely drop.
Your motor won't pull 1800 rpm without getting deeper into the pedal.
Here's a speed/tire/rpm calculator.
http://www.powerblocktv.com/resources/
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