RPMs at 70mph
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Join Date: Dec 2001
Location: Northern California
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About 2100 rpm @ 70 mph with Michelins (255/55 R18).
Also easy to calculate: 713 revolutions per mile taken from the tire catalog times 0.73:1 top gear in the 7G-tronic, times 3.45:1 final ratio front and rear, times 70 MPH/60 MPH.
The Grand Cherokee CRD has a .83:1 top gear in the 5-speed and might turn a little higher.
Also easy to calculate: 713 revolutions per mile taken from the tire catalog times 0.73:1 top gear in the 7G-tronic, times 3.45:1 final ratio front and rear, times 70 MPH/60 MPH.
The Grand Cherokee CRD has a .83:1 top gear in the 5-speed and might turn a little higher.