Fuel Mileage - Page 10 - Dodge Cummins Diesel Forum
2013-2018 General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING - Sponsored by: StarLite Diesel

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post #109 of 115 (permalink) Old 05-23-2019, 06:24 AM
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I had pens go out all the time when I was manually logging.


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post #110 of 115 (permalink) Old 07-07-2019, 01:29 AM
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Based on the trucks display, my 2017 2500 Mega was averging around 17 to 18 MPG mixed city/highway. This was pretty consistent for the first 2 years I owned her.

A couple months ago I did my first tire change from the stock Firestone's to a little beefier Nito Terra Grappler G2 LT295/60R20. I immediately saw my average mileage drop to about 15.5 - 15.9. Is this typical with such a slight tire size change?

Also, in the last couple of weeks I've notice another decrease and am now averaging around 14.5 - 14.9.

I read on an earlier post of this thread that gas quality might make a difference. I recently started filling up at a gas station with diesel around 50 cents per gallon cheaper (that's a big difference in California with our stupid gas prices). Do you guys think this could be a lower quality fuel and causing the additional decrease?

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post #111 of 115 (permalink) Old 07-07-2019, 03:16 AM
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Originally Posted by WWIIBuff View Post
Based on the trucks display, my 2017 2500 Mega was averging around 17 to 18 MPG mixed city/highway. This was pretty consistent for the first 2 years I owned her.

A couple months ago I did my first tire change from the stock Firestone's to a little beefier Nito Terra Grappler G2 LT295/60R20. I immediately saw my average mileage drop to about 15.5 - 15.9. Is this typical with such a slight tire size change?

Also, in the last couple of weeks I've notice another decrease and am now averaging around 14.5 - 14.9.
How are you calculating Mileage with your new tire size to compare?

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post #112 of 115 (permalink) Old 07-07-2019, 03:26 AM
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How are you calculating Mileage with your new tire size to compare?
Actually that is a good point I didn't even think about. I guess my speedo is probably off a bit now too.

I was still going by the mileage readout on the display. Is there some way to re-calibrate everything?

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post #113 of 115 (permalink) Old 07-21-2019, 09:47 AM
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Hello, could you please let me know what’s the app. you use to track mpg? Thanks
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post #114 of 115 (permalink) Old 07-21-2019, 04:13 PM
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Actually that is a good point I didn't even think about. I guess my speedo is probably off a bit now too.

I was still going by the mileage readout on the display. Is there some way to re-calibrate everything?
There is a program called alfaOBD that you can use to change the tire size. You'll need the program (~$50) and a OBD bluetooth adapter (~$70)

https://play.google.com/store/apps/d...faOBD&hl=en_US




Info on how to use it here..
https://www.ramforum.com/threads/alfaobd.123982/


FYI, you might want to try and hand calculate your mileage. My 2016 mega is anywhere from 1.5-3 mpg high on the display.

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post #115 of 115 (permalink) Old 07-21-2019, 07:52 PM
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Hello, could you please let me know what’s the app. you use to track mpg? Thanks
I use an app called fillup on android. July obviously only has one fillup, the next tank won't be as good. Bought a new house so been hauling a trailer mostly.

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