Engine rpm

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Engine rpm

Home > Discussion Forum > Mechanic's Corner - Engines

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Engine rpm by J. Mizell

Just acquired a low mileage 93 Holiday Rambler diesel pusher. It has a B5.9 Cummins and Allison 6 speed transmission. Question is. At 65mph I am showing 1350 rpm, with the transmission in "economy" position(pretty flat land here in East Texas).I've been told that I need to be running closer to 1700-1800 to get the best fuel economy(presently get 9-10). Anyone out there have any thoughts on this? Thanks.

All Messages in Thread		Author	Date
	Engine rpm	J. Mizell	2-15-07
	Re: engine rpm	wrench	2-18-07