Yes, 28+ mpg isn't a dream!!!! - Page 13 - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7 Liter General Discussion General Chit Chat About the 6.7L 3rd generation Cummins - NO ADVERTISING

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post #145 of 543 (permalink) Old 06-05-2017, 08:42 AM
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I read what you were at for rpms with your manual and the effency %s between an auto and a manual. With my 68rfe, 4:10 gears and 33" tires at 80 mph I'm at 1,950 RPM. Compared to your 56 I wonder if an automatic would be more efficient than a manual even with my set up. A 3:73 or 3:42 would only help that much more. What's your opinion?


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post #146 of 543 (permalink) Old 06-05-2017, 10:15 AM
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I have a 2009 qcsb ram 3500 srw with 3.42 im not willing to trade gears but will test your tune out and give you feed back and return the tune i drive 120 miles round trip for work every day 95% highway
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post #147 of 543 (permalink) Old 06-05-2017, 12:07 PM Thread Starter
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Originally Posted by twitch59 View Post
I have a 2009 qcsb ram 3500 srw with 3.42 im not willing to trade gears but will test your tune out and give you feed back and return the tune i drive 120 miles round trip for work every day 95% highway
My goal would be to lower cruising rpm to 1050-1100 [email protected] I've hauled enough freight through all of the 48 to say, so what if you have to shift going uphill. I've never rode in an 18 (Some of mine were up to 58 wheels) that you didn't drop into direct or lower going up any form of hill. And hell, most of the time, at 55mph you had to be in direct anyway, most trucks I drove (including the 1999 625hp fire breathing kw below) because they were geared around 2.42 up to 3.58. It's just the nature of diesels.

Twitch, sure. Do you have current and consistent data for the trip to compare. Need a baseline to see the difference. Pm coming.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft

Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #148 of 543 (permalink) Old 06-05-2017, 12:14 PM Thread Starter
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Originally Posted by MUDRUNNER408 View Post
I read what you were at for rpms with your manual and the effency %s between an auto and a manual. With my 68rfe, 4:10 gears and 33" tires at 80 mph I'm at 1,950 RPM. Compared to your 56 I wonder if an automatic would be more efficient than a manual even with my set up. A 3:73 or 3:42 would only help that much more. What's your opinion?
I'm sure it would help, I won't state efficiency because I don't know. If you're in lock up, I'm sure it's close. If you stop and go all the time, an automatic will be a complete failure for you. The problem is finding the exact amount you must drive to make up for the slipping through forward gears to lock up. That's saying, if lockup is as efficient as a manual. I know an automatic is capable of getting the mileage, but the day I can no longer shift gears will be a day I go back to a c15 with a 13 or 18 Eaton attached to it.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft

Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #149 of 543 (permalink) Old 06-05-2017, 01:00 PM
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For a better comparison and also more inline with what you found on your drive at 60 mph I'm in 6th gear around 1500 rpm (will double check later). My truck will not go into 6th until 57-58 mph

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post #150 of 543 (permalink) Old 06-05-2017, 01:05 PM Thread Starter
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For a better comparison and also more inline with what you found on your drive at 60 mph I'm in 6th gear around 1500 rpm (will double check later). My truck will not go into 6th until 57-58 mph
I'm in 6th at 35mph. That is closer to my pickup, rpm wise. I'd like to see somebody that has some extremely good gearing test it as well. If it holds true that 1100 rpm works well, it goes to show all the gear swaps people do may be more detrimental than good.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft

Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #151 of 543 (permalink) Old 06-05-2017, 01:58 PM Thread Starter
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Quote:
Originally Posted by MUDRUNNER408 View Post
I read what you were at for rpms with your manual and the effency %s between an auto and a manual. With my 68rfe, 4:10 gears and 33" tires at 80 mph I'm at 1,950 RPM. Compared to your 56 I wonder if an automatic would be more efficient than a manual even with my set up. A 3:73 or 3:42 would only help that much more. What's your opinion?
Check this out. I know these trannies are different, but I've noticed similar results in almost every vehicle I've driven. From a 12ver to cars and even now seems the 3rd and 4th gens.

Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com

2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft

Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #152 of 543 (permalink) Old 06-05-2017, 04:12 PM
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Interesting thread, subscribing.

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post #153 of 543 (permalink) Old 06-05-2017, 05:59 PM Thread Starter
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Low and behold, I have a tune that guarantees 20mpg... No promise you'll do 55mph, but as a real time econ mode. It allows you to maintain a max fuel that with my pickup at that fuel rate in 6th will maintain 23.1 mpg.... add in mile long coasting with fuel cut, little to no idling and 25+ is a breeze. You won't rocket over hills, you'll lose speed, but if I'm gonna break 30mpg in a 4x4, I need all the help I can get lol.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft

Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #154 of 543 (permalink) Old 06-05-2017, 06:32 PM Thread Starter
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Here is a MPG calculator, this assumes 100% efficiency. It will give you a good idea though of speeds with gear, rear-end and tire combos. I didn't put in the auto gears, sorry. I can make some changes if you guys really want it.
Attached Files
File Type: zip Fuel Mileage Calculator3.zip (9.9 KB, 63 views)

2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft

Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #155 of 543 (permalink) Old 06-05-2017, 07:49 PM
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I'm not able to open the file. Says safari cannot download

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post #156 of 543 (permalink) Old 06-05-2017, 07:53 PM Thread Starter
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Its a zip file

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft

Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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