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J&M in Quincy IL and I believe Jacobson in DeMoines Ia has 13spds.Sharkey is trying out the 13spd in their tanker fleet.

I talked with Housby Mack in DesMoines Ia.He said Jacobson's trucks were 455's,60" sleeper,13spd and 3:25 rears.
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My buddies 2012 CHU daycab with no fairings, 505 HP, Mack 10 speed trans, rear gears are in the 3.40 range ( cant remember) just pulled a loaded van back and forth to StLouis at 68 MPH and he got 6.8 MPG. Boss man said he heard of MP-8's with super high rear gears running 13 speed trans and mostly running in 12 th gear but on flat ground going to 13th gear and the engine RPM dropping to 1100 RPM and getting some unheard of MPG. Not saying its true but thats what I heard.

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