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 112 (permalink) Old 05-23-2019, 06:24 AM
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post #110 of 112 (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 112 (permalink) Old 07-07-2019, 03:16 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.
How are you calculating Mileage with your new tire size to compare?

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post #112 of 112 (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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