Taching 2k with 3.55 in 6th at 70mph? - Ford Powerstroke Diesel Forum
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Old 09-17-2012, 01:58 AM
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Taching 2k with 3.55 in 6th at 70mph?

Alright my question is pretty basic. Why am I taching at almost 2000 rpm while in 6th gear cruising at 70?

Does this seem high to anyone else? And what is the optimal rpm for fuel efficiency?

Stock sized tires BTW.
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Old 09-17-2012, 04:05 AM
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seems high

That does seem high. Mine is right at about 1650 at that speed. I have same gears too.
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Old 09-17-2012, 04:31 AM
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You sure you have 3.55s?
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Old 09-17-2012, 05:18 AM
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on my 97 with 355's and stock size tires I turn about 2000
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Old 09-17-2012, 05:44 AM
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20's or 18" rims?
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Old 09-17-2012, 09:04 AM
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I'm pretty sure Im also taching around 1650 at 70 with my 3.55 and 20" tires in 6th gear.
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Old 09-17-2012, 01:38 PM
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Hmmm, spent yesterday afternoon on the Pa Turnpike @ 70-75 and was around or below 1800 IIRC. I have the 18" wheels with Michelins. Pretty sure it wasn't near 2k RPM considering the truck averaged 19.3mpg for the tank with 2 regens.
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Old 09-17-2012, 02:16 PM
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80 mph is right at 2k for me with 355s.
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Old 09-17-2012, 02:33 PM
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About 1,650 at 70 MPH with 3.31's
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Old 09-17-2012, 04:58 PM
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I checked

I'm running 3.55 and 20 inch rims with 35 toyo mt and I'm right at 1650 or 1700 at 70 mph. I took a close look coming home to make sure!
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