Diesel MPG (Diesel only please) - Chevy Colorado & GMC Canyon
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post #1 of 866 (permalink) Old 01-14-2016, 10:35 PM Thread Starter
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Diesel MPG (Diesel only please)

I did my first real fill up today. Since the last fill up I drove 445 miles in 12.1 hours for an average speed of 36.8 mph. I used 17.896 gal of fuel for an mpg of 24.87.

BTW, I paid $1.799 for the diesel fuel.
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post #2 of 866 (permalink) Old 01-14-2016, 10:37 PM
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How did that compare to the DIC mpg?

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post #3 of 866 (permalink) Old 01-14-2016, 10:40 PM Thread Starter
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Originally Posted by Eric Roberts View Post
How did that compare to the DIC mpg?
Great question - I should have answered it in the original post. Trip B, which was the tank, showed 445.3 miles and 24.7 mpg.

I would say it was very accurate because it is hard to tell when the tank is really full. You can keep adding a little at a time for quite a while.
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post #4 of 866 (permalink) Old 01-14-2016, 10:43 PM
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Originally Posted by Eric Roberts View Post
How did that compare to the DIC mpg?
Sounds like that is the DIC averages. I doubt he hand calculated the average speed over an entire tankful. I am interested in the tank distance on a pure highway trip at 30+ MPG.
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post #5 of 866 (permalink) Old 01-14-2016, 10:44 PM
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Originally Posted by dmcdufford View Post
I did my first real fill up today. Since the last fill up I drove 445 miles in 12.1 hours for an average speed of 36.8 mph. I used 17.896 gal of fuel for an mpg of 24.87.

BTW, I paid $1.799 for the diesel fuel.
$1.80 is a good price for diesel, around here its $2.39
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post #6 of 866 (permalink) Old 01-14-2016, 10:48 PM Thread Starter
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$1.80 is a good price for diesel, around here its $2.39
We are about $2.02 to $2.10 most places, but for the last few months two stations out by my farm have been having a price war. I filled one tank for $1.699 (I had a diesel VW Jetta).

I hope they keep at it for a while. It is about 5 minutes out of my way but I can live with that.
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post #7 of 866 (permalink) Old 01-14-2016, 10:59 PM Thread Starter
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Originally Posted by savagebob View Post
Sounds like that is the DIC averages. I doubt he hand calculated the average speed over an entire tankful. I am interested in the tank distance on a pure highway trip at 30+ MPG.
One of the displays on the DIC is engine hours, which is what I used along with mileage to calculate the average speed. I keep a spreadsheet with the values at each fill-up.

On this first tank at a 71 mph cruise I got about 29 - 30 mpg over a 25 mile stretch. At 55 mph I was in the mid 30's.

.
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post #8 of 866 (permalink) Old 01-15-2016, 02:17 AM
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I am hoping for much better than 24-25 MPG. That's a bit disappointing!

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post #9 of 866 (permalink) Old 01-15-2016, 02:51 AM
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I am hoping for much better than 24-25 MPG. That's a bit disappointing!
Truck is brand new.....

Mileage also depends on terrain. Which he did not give.

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post #10 of 866 (permalink) Old 01-15-2016, 05:24 AM
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Quote:
Originally Posted by DiNoto View Post
I am hoping for much better than 24-25 MPG. That's a bit disappointing!
I am surprised, to put it mildly.

Quote:
Originally Posted by bglf83 View Post
Truck is brand new.....

Mileage also depends on terrain. Which he did not give.
But to do 400+ miles in a day, you are on a highway. or running red lights! I would expect that local driving.
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post #11 of 866 (permalink) Old 01-15-2016, 05:47 AM Thread Starter
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Originally Posted by 100MPG View Post
I am surprised, to put it mildly.

But to do 400+ miles in a day, you are on a highway. or running red lights! I would expect that local driving.
Why are you surprised? It is a 4WD and the actual is between its combined and highway rating. I am not babying the truck.

Also, it is not a day - I have had the truck for a week and the trips were over a 5 day period and as I mentioned the average speed was about 37 mph.
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post #12 of 866 (permalink) Old 01-15-2016, 06:36 AM
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The environment sounds like it's heavily biased to city driving, so the numbers look pretty good. I'm in the low teens right now with my V6 gasser and a short 4 mile commute on winter gas with a LOT of idling. I'd be plenty happy with those numbers in the city. On the highway I'd expect it to get well into the mid 30's with my driving style.

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post #13 of 866 (permalink) Old 01-15-2016, 07:33 AM
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I am convince the Diesel MPG numbers will be better than the V6, also expecting lower than anticipated. Same happened with the V6; people had high hopes to be on the high 20s when in real life is lower. Still a good number for a truck though.

Unless the engine has the same power output of the 4 Cly gasser, I see no reason to get expectacular MPG numbers. I bet if you take the Duramax out and place a VW TDI instead, you will get easy on the mid 30s but not real power like the V6, just like the 4 banger.

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post #14 of 866 (permalink) Old 01-15-2016, 07:37 AM
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Originally Posted by 100MPG View Post
I am surprised, to put it mildly.



But to do 400+ miles in a day, you are on a highway. or running red lights! I would expect that local driving.
His average speed was in the mid 30mph.....means mostly city driving....12 hours of driving.....not 12 hrs in one day...geez you guys.......25 mpg mostly city is great.
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post #15 of 866 (permalink) Old 01-15-2016, 11:28 AM
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Originally Posted by Yooper2001 View Post
His average speed was in the mid 30mph.....means mostly city driving....12 hours of driving.....not 12 hrs in one day...geez you guys.......25 mpg mostly city is great.
I agree, I believe 25 in city driving for a truck is awesome.

Thanks for the data.

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post #16 of 866 (permalink) Old 01-15-2016, 12:17 PM
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With an average speed in the mid-30s on my V6, I can typically average about 20-21 MPG. (Mine is 2WD).

I would have hoped for slightly better MPGs from the diesel. However, first tank, be interesting to see after maybe 2-3K miles.

Does "winter-blend" impact diesels like it does gasoline engines? Could we expect better performance in warmer days? Is he using remote start or anything else to drive fuel mileage down? - Granted, that should show up in his average speed. The time spent learning the truck, checking out the acceleration & just getting used to truck will impact mileage. Another reason to await further results down the road.

Finally, and this is not the topic of this thread, how well does the truck perform overall, in regards to the shifting complaints of many? (This is a whole nuther thread I hope the OP addresses, and we need to wait till transmission has learned the driver.

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post #17 of 866 (permalink) Old 01-15-2016, 12:32 PM
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If I am not mistaking, Diesel winter blends are more agressive than Gasoline. Low temps is Diesel fuel biggest eneny. From my days in the military on very cold weather periods, the the Diesel created a parafin at lower temps. Since we all went JP8 as universal fuel is no much the case. Even using straight Diesel on an M 1941 Pot Belly stove was dificult to ignite. JP4 and MoGas did a better job.
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post #18 of 866 (permalink) Old 01-15-2016, 12:42 PM
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Originally Posted by CaryBosse View Post
With an average speed in the mid-30s on my V6, I can typically average about 20-21 MPG. (Mine is 2WD).

I would have hoped for slightly better MPGs from the diesel. However, first tank, be interesting to see after maybe 2-3K miles.
Given OPs is a 4WD then we'll likely be looking at ~27MPG in the same driving conditions/speeds on a Diesel 2WD (comparing apples to apples). 7MPG improvement in the city is awesome, combined with engine break in and diesel tunes in the pipeline I suspect we could see that more toward 10MPG by end of year.
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post #19 of 866 (permalink) Old 01-15-2016, 01:00 PM
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Given OPs is a 4WD then we'll likely be looking at ~27MPG in the same driving conditions/speeds on a Diesel 2WD (comparing apples to apples). 7MPG improvement in the city is awesome, combined with engine break in and diesel tunes in the pipeline I suspect we could see that more toward 10MPG by end of year.
If we can see those types of mileage numbers, I agree it would be good.

I suspect I will replace my 2015 around 2020, might pull it into 2019 depending on what 2020 legislation might be doing to our trucks detrimentally. In any event, I could see a diesel 4WD in my future if some fool in Washington hasn't outlawed diesel by then.

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post #20 of 866 (permalink) Old 01-15-2016, 01:06 PM
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... some fool in Washington hasn't outlawed diesel by then.
That is why I am doing the same thing. Will not be surprised Diesel might get a political black eye bigger than what it is now.
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