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How has the 3.64 rear-end affected fuel economy and cruising RPM?

April 26, 2017affected cruising economy FUEL rear-end RPM

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How has the 3.64 rear-end affected fuel economy and cruising RPM?

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I have observed a slight loss of fuel economy on the highway (less than 1 MPG) but around-town mileage has not suffered noticeably. With the stock 3.46 rear-end, the engine was turning at 2800 RPM at 75 MPH in 5th gear. The new differential raises that figure to 2900 RPM at 75 MPH. However, these sacrifices are easily eclipsed by the seat-of-the-pants difference in performance.