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  #11  
Old 11-17-2012, 11:37 AM
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down 10; I've got the 3.55's with LSD in a 4x4 Crew and average 15-17 city/hwy mix and between 19-23hwy depending on terrain. Towing the 3000lb boat, for 200miles round trip, averaged between 13.9-14.5mpg in Tow/Haul with ERS in 5th.
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  #12  
Old 11-17-2012, 12:48 PM
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Quote:
Originally Posted by TRCM View Post
I hope mine goes that way, but right now, with ~2500 miles on it, my numbers are about 2/3 of what yours are, and I DO NOT hot rod it.

You can see by my spreadsheet, the #'s ain't too good so far .

I Hot Rod Most of the time. haha. But I am using imperial Gallon (1 gallon = ~4.546Litres) where as you are using US gallon (1 gallon = ~3.785Litres).
So my average of 18.82mpg would actually be 15.67miles per US gallon.
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  #13  
Old 11-17-2012, 12:59 PM
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I had a customer ask me yesterday when we were ordering his truck. I told him there was really not a big enough difference. I have 3.55 and my father has 3.92 and our last road trip we got almost identical mpg... So I told my customer I would go 3.92 if it was me. Not a big enough difference mpg to offset the pros of going with 3.92 gears.
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  #14  
Old 11-17-2012, 02:12 PM
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Quote:
Originally Posted by jacobson.s View Post
I Hot Rod Most of the time. haha. But I am using imperial Gallon (1 gallon = ~4.546Litres) where as you are using US gallon (1 gallon = ~3.785Litres).
So my average of 18.82mpg would actually be 15.67miles per US gallon.
Well, my average right now, is 13.5....still way below your 15.67
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  #15  
Old 11-17-2012, 02:29 PM
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3.92 will be better for city mpg, 3.55 will be better for highway mpg... so pick based on what type of driving you do.
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Old 11-17-2012, 03:31 PM
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I get between 13-14 mpg city and 17-19 highway. Off road I get about 9-10 mpg.

'12 CC, Hemi 4x4, 3.92, LS, stock 20" tires

Last edited by SFVDOC; 11-17-2012 at 03:33 PM.
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Old 11-17-2012, 03:51 PM
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Get the 3.92's. You'll be far happier, and the truck will be too.

The reduced engine load more than makes up for the increased RPM's. You won't notice any less MPG, and will potentially notice better MPG.
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Old 11-17-2012, 06:16 PM
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Quote:
Originally Posted by emjohn4 View Post
Get the 3.92's. You'll be far happier, and the truck will be too.

The reduced engine load more than makes up for the increased RPM's. You won't notice any less MPG, and will potentially notice better MPG.
That makes sense if you're talking mostly city driving, but for mostly highway driving, the 3.55s will give you noticeably better mpgs.
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Old 11-17-2012, 07:42 PM
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Quote:
Originally Posted by Copperhead Ram View Post
That makes sense if you're talking mostly city driving, but for mostly highway driving, the 3.55s will give you noticeably better mpgs.
I am sure that you're right about highway, as long as it is flat. Any hills and the 3.92s will have the advantage again.

But flat highway, low rpm is better for mpg as you mention.
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Old 11-18-2012, 03:27 AM
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Just for reference since I have a 2009, Hemi, CC, 4X4 with 3.55 rear

MPG depends on a lot of factors, how heavy your foot is on the pedal, type of terrain, winds Head (worse) tail (better), tires, lift if you do it, weight of things you may constantly carry around and I am sure other things also.

3.55 should net you more mpg at higher speeds than the 3.92.

3.92 should net you more mpg when accelerating and at lower speeds, under 50 mph.

My truck can average just over 20.0 mpg on fairly flat terrain, slight headwind and being gentle on the pedal with summer blend gas and just over 19 with winter blend traveling at 72 mph. This is all with 89 octane

City driving can range from 12 to 15 depending on how heavy traffic is, how many lights and just plain idle time waiting at light and traffic.

Tow rating is lower for me than on following years because they were being conservative with the new suspension. 3.92 gears will net you a higher tow rating than 3.55.

When breaking in the new truck I was not gentle with it but I did not beat it either. It seems to loosen the drive train better I feel and seems to set a more firm shift when the computer is memorizing your driving habits. Just my observation.

Everybody is a different driver and will receive different results but this should be a ball park figure to what is possible.
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