RPM's at 70mph - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 03-03-2009, 02:19 PM Thread Starter
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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.

04.5 LLY DURAMAX. EFI, AIR, FUEL, TRACTION AND MORE! POWERSTROKE SLEEPER SLAYER!!
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post #2 of 16 Old 03-03-2009, 02:20 PM
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right around 2000 rpm's with 3.73 gears


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post #3 of 16 Old 03-03-2009, 02:23 PM
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post #4 of 16 Old 03-03-2009, 02:34 PM
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im right under 2000rpm when cruisin at 70

-Dave

'07 F250 FX4 Supercab SB
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post #5 of 16 Old 03-03-2009, 03:00 PM Thread Starter
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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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post #6 of 16 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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post #7 of 16 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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post #8 of 16 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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post #9 of 16 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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post #10 of 16 Old 03-04-2009, 06:31 AM
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2100 rpm @ 70 with 4.30's on 37's.

1970 F250 Crew Cab rebuilt/restored w/Cummin s 4bt

8v, M5R2 Tranny, VE pump, DennyT stage 2 pin, M&H Dynamic Timing, 3200k gov spring, Hx30/Hx35 Twins, 40hp styx, smoke screw screwed, star wheel cranked, Hydroboosted
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