Fuel mileage delema

[Booch035]

I took a 4500 mile trip from Atlanta,Ga. to Breckenridge, Co. and the average was 14.2 and I was running 70-95 mph. I guess I'm getting better then most. I had an 06 5.9 with 4.10 4x4 with the same type of camper shell and that truck would pull 21 mpg all day long. I thought this one should get at least 18+ mpg. This 17 pulls like a train and rolls so nice! Maybe I should be happy with the mpgs! Thanks guys!

70 to 95 MPH? That will do it right there.

With 4.10's anything above 65 MPH is going to drink the fuel!!!

Keep it between 65 and 70 and see what it gets. Y

You will be surprised.

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[CMB]

Something else you may want to consider is tire size. I too have 4.10s but with 35" tires im back to the 3.72 neighborhood. I've had 35s on the truck since I've owned it. Even with this tire size there are times I wish the gears were a little taller. Towing is a dream though. This is with the RFE trans.

14 mph sounds low but driving style definitely plays a part.

My sweet spot is between 65-75 mph

Cheers,

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[cumminsdieselfreak]

I took a 4500 mile trip from Atlanta,Ga. to Breckenridge, Co. and the average was 14.2 and I was running 70-95 mph. I guess I'm getting better then most. I had an 06 5.9 with 4.10 4x4 with the same type of camper shell and that truck would pull 21 mpg all day long. I thought this one should get at least 18+ mpg. This 17 pulls like a train and rolls so nice! Maybe I should be happy with the mpgs! Thanks guys!

You answered all of your own questions with this post. 4.10s, 70-95mph, high top camper cover.... Remember to hand calculate and never trust the dash mpg readout.

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[MC250r719]

The fast lane truck guys did an empty highway fuel mileage run on a 2015 crew cab 2500 4x4 6.7 Cummins and hand calculated 24.7.

That was all highway at 65MPH.

.

I usually get 17.5 city and 20 highway @ 78MPH hand calculated.

Annotation 2019-08-08 165005.jpg

This is a picture of my mileage.

Pretty close to the lie-o-meter.

real mpg.jpg

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[MC250r719]

I usually get 17.5 city and 20 highway @ 78MPH hand calculated.

Correction 2WD with added weight.

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[TexNeck]

Your trucks 2WD?

What size tire you running?

Also what tune you run on with DRD?

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[MC250r719]

No mine is 4x4 LOL, the truck that the fast lane truck tested was 2WD.

I have 295’s on mine, cooper AR3 XLT.

From the highway miles I drive I like to test all of the tunes.

They pretty much all get the same mileage.




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[Jeeper89]

I'm at work at the moment, butI ran out there quick and looked at the batteries. One of the negative posts has a fair ammount of "fur" on it. I will clean it up tonight and do a load test on both batteries. I had replaced them both this past January.

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[CMB]

I'm at work at the moment, butI ran out there quick and looked at the batteries. One of the negative posts has a fair ammount of "fur" on it. I will clean it up tonight and do a load test on both batteries. I had replaced them both this past January.

Good call - low volt does crazy things, furry battery posts definitely won't help.

P.S. this might be the wrong thread

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[6.7 Coal Train]

I'm doing around 18 +/- highway in the summer at 75mph and was disappointed.

I'm sure if I could manage to commit to 70mph tops I'd do a bit better but thought I'd push 20mpg easily after deletes on 120hp tune.

going back to 33" tires next time around too to see if that helps (34 right now).

EDIT: 3.42 gears

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