RPM's at 70mph - Ford Powerstroke Diesel Forum
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Old 03-03-2009, 02:19 PM
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RPM's at 70mph

Just thought I would ask what everybody is seeing for RMM's @ 70mph or so. Where is the best RMP range to be in with the 6.0 for milage and for power while cruising.
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Old 03-03-2009, 02:20 PM
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right around 2000 rpm's with 3.73 gears
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Old 03-03-2009, 02:23 PM
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Old 03-03-2009, 02:34 PM
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Send a message via AIM to zippy557
im right under 2000rpm when cruisin at 70
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Old 03-03-2009, 03:00 PM
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Quote:
Originally Posted by jay diesel View Post
right around 2000 rpm's with 3.73 gears
What size tires are you running
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Old 03-04-2009, 05:35 AM
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I turn about 2,000 rpm at 70 mph with 3.73 gears and I am running 295/70r18. I get about 15.4 according to the lie o-meter stock and 16.2 with my old superchip. Hope this helps.
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Old 03-04-2009, 05:42 AM
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running right around 2k rpm's with 35's and stock gears @ 70 mph, rough calculation of fuel mileage is around 14, which is a little low in my opinion
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Old 03-04-2009, 05:57 AM
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18.5 hand calculated this weekend running 72-73 hard to tell on spedo running 2000-2100 rpms lubbock to dallas to canton then back to dallas (almost no stop and go) aprox 510 miles with the last 50 miles 80-85 because of traffic. I have 3.73 gears and 265/75/16 tires and am running a x2 with spartans ase.... I had 49 miles left on the tank but found diesel at 1.93 a gallon... I could have gotten better mpg I think if I had have driven 60-68 but as it is 73 seems like you are crawling any slower would have drove me crazy
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Old 03-04-2009, 06:28 AM
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I am running right around 2,000 as well. I have 3:73's, 285 75 16's, and a six speed. According to the inaccurate display I will do best at 55-60 in 6th gear but most of the time I am in a hurry and that speed doesn't cut it. My hand calculated highway that I took on a trip to North Carolina was just under 20mpg driving conservatively while pulling a large pop up camper.
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Old 03-04-2009, 06:31 AM
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2100 rpm @ 70 with 4.30's on 37's.
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