Diesel MPG (Diesel only please) - Page 47 - Chevy Colorado & GMC Canyon
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post #921 of 940 (permalink) Old 05-04-2017, 12:11 AM
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Originally Posted by Fubar2016 View Post
23.1 is normal for city stop-n-go traffic. Mine hovers around there. The high mileage you are seeing here is predominately for highway mileage. On a 300 mile trip (95% highway) I took this past weekend my avg was 31.3.

About 6 weeks ago I took off the air dam and put on a 1.25" leveling kit. I got 33.3 mpg on that same drive before I made the mods so the mods cost me 2 mpg. It was 20-25 degrees cooler during the 33.3 mpg trip so that may have contributed to the higher mileage too. I know my previous car felt like a different animal when it was 50 degrees outside - it loved the cool air. But now it's a muggy 90 degrees.
Did your mileage improve when you removed the air dam? I want to remove it but, I was afraid it will hurt MPG.

Mike
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post #922 of 940 (permalink) Old 05-04-2017, 06:38 AM
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Did your mileage improve when you removed the air dam? I want to remove it but, I was afraid it will hurt MPG.

Mike
City mileage stayed the same, highway miles dropped exactly 2 mpg - but I added the leveling kit and removed the air dam at about the same time so it's hard to say how much removing the air dam dropped the mileage. I'm guessing removing it was responsible for most of the drop because the leveling kit only raised the front about 1 inch. Then again, the cooler air might have made a difference too. Sorry I can't give you a firm answer - but three variables changed so it's hard to say. But I will say I like the looks of the truck so much better without the dam. I have it in my garage so if I ever want to put it back on I could. Removing it is not too hard - if you ever work on cars at all it's a piece of cake really. I think the people that say it's hard never touch a wrench.
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post #923 of 940 (permalink) Old 05-04-2017, 12:15 PM
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How the hell you guys gettin in the 30s driving like grandma. Whats speeds. Im going about 80mph and avg. 24mpg

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post #924 of 940 (permalink) Old 05-04-2017, 02:58 PM
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I'm wondering how much the local area matters? I'm in S. FL and we've taken our prius on several out of state trips. Without fail, every time our mileage gets significantly better as we get farther north, and gets worse as we return home. Most of the change happens between south and north Florida. At ~75mph we start out in the upper 30's (37-38mpg), and as we leave Florida we get into the lower 40's (42-43mpg), then the exact opposite on the way home. I don't have an explanation yet, but I use cruise control and cruise the same speed all the way up, and I watch the mileage change as the miles go by. So I guess my point is, I wonder how much the geographic location affects mileage, everything else being equal.
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post #925 of 940 (permalink) Old 05-04-2017, 10:46 PM
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Originally Posted by Fubar2016 View Post
City mileage stayed the same, highway miles dropped exactly 2 mpg - but I added the leveling kit and removed the air dam at about the same time so it's hard to say how much removing the air dam dropped the mileage. I'm guessing removing it was responsible for most of the drop because the leveling kit only raised the front about 1 inch. Then again, the cooler air might have made a difference too. Sorry I can't give you a firm answer - but three variables changed so it's hard to say. But I will say I like the looks of the truck so much better without the dam. I have it in my garage so if I ever want to put it back on I could. Removing it is not too hard - if you ever work on cars at all it's a piece of cake really. I think the people that say it's hard never touch a wrench.
Good to know. I'm with you, the air dam looks awful.

I think I'll consider removing the air dam after I get a 'tune' installed and confirm an improvement in MPG. I figure if I can get some extra MPG's with a 'tune' it will balance the decrease with removing the ugly air dam.

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Originally Posted by eyekyu View Post
How the hell you guys gettin in the 30s driving like grandma. Whats speeds. Im going about 80mph and avg. 24mpg

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MPH and consistent speed plays an important role, especially with a moving a brick like this truck down the road which is why I chose to use the cruise control.
I rarely saw 80MPH on my trip...and only when I was playing around in the mountain passes experiencing the mini-max's impressive torque.

I will add, and this is important, I didn't stop. My drive was roughly 18 hours each way, split between two days.
I stopped the truck only once a day between destinations, so, I didn't have frequent restroom/food breaks. When you stop or slow, you have to accelerate which, in turn, wastes fuel. I didn't do that, I kept driving. Some might not be able to do that for many reasons...

Plus, I was the only passenger and there was only luggage for one.

Quote:
Originally Posted by MattFL View Post
I'm wondering how much the local area matters? I'm in S. FL and we've taken our prius on several out of state trips. Without fail, every time our mileage gets significantly better as we get farther north, and gets worse as we return home. Most of the change happens between south and north Florida. At ~75mph we start out in the upper 30's (37-38mpg), and as we leave Florida we get into the lower 40's (42-43mpg), then the exact opposite on the way home. I don't have an explanation yet, but I use cruise control and cruise the same speed all the way up, and I watch the mileage change as the miles go by. So I guess my point is, I wonder how much the geographic location affects mileage, everything else being equal.
I've experienced the same phenomenon but, in other vehicles.

On this trip, I had better mileage heading south.

Mike
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post #926 of 940 (permalink) Old 05-05-2017, 10:19 AM
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Filled up this morning using same pump and filling style as usual. Right on 30 mpg. Last two fill ups were 28.8 and 29.2. Keeps gettin' better. Hilly SW PA too.

Tire pressure may very well have an effect, I've noticed pressure won't fluctuate as much w/ more consistent warmer weather. Cold nights to hot days could bring up to a 3 lb change according to the TPMS FWIW. I'll adjust pressure once/ week anymore, never let it under 35 tho. Truck likes 37-38 lbs for ride and mileage. 35 lbs seams like it sucks the mileage down.

Usually take on 16.5-18 gallons.

450 mile avg is currently 31.1, GMC app is 29 lifetime FWIW, pretty close overall I'd say.

I ain't complainin'.
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post #927 of 940 (permalink) Old 05-07-2017, 08:56 AM
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Quote:
Originally Posted by Fubar2016 View Post
23.1 is normal for city stop-n-go traffic. Mine hovers around there. The high mileage you are seeing here is predominately for highway mileage. On a 300 mile trip (95% highway) I took this past weekend my avg was 31.3.

About 6 weeks ago I took off the air dam and put on a 1.25" leveling kit. I got 33.3 mpg on that same drive before I made the mods so the mods cost me 2 mpg. It was 20-25 degrees cooler during the 33.3 mpg trip so that may have contributed to the higher mileage too. I know my previous car felt like a different animal when it was 50 degrees outside - it loved the cool air. But now it's a muggy 90 degrees.
I too removed the air damn (as soon as i got the truck) and added the 1.25 zone leveling kit.
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post #928 of 940 (permalink) Old 05-07-2017, 09:34 AM
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Must be my driving style but the best I have seen and this is according to the DIC with the 50 mile range is 30, I have left the trip B average alone and have approx 4400 miles , the average is reading 23.8 , majority of my driving is 70 highway, 30city , of course the highway runs are only about 25-35 miles each , I have yet to burn a full tank on a roadtrip as of yet , my average speeds on the highway are at 80mph , trip A shows 24.1 which I am more than satisfied with , I came from a Mazda CX5 and only averaged at 80mph highways speeds about 25 , again guys on that forum were hitting the 30's , just like here , kind of tough running at 60 when the flow of traffic is at 80, also see where some of the gassers are getting 26 , not sure how that could happen either . I am more than happy being in the EPA range, if people are truly getting in the 30's , then why did the EPA rate it at 20/28 for the 4wd , and 21/31 for the 2WD ?
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post #929 of 940 (permalink) Old 05-08-2017, 03:30 PM
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Put 370miles on the truck over the weekend.

185M to cabin one way yielded 26.8 mpg (computer calculation)
185M back home with canoe on top was 26.9-27.0 mpg

conclusion: Sharks are fast.
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post #930 of 940 (permalink) Old 05-08-2017, 04:04 PM
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Originally Posted by lusid View Post
Put 370miles on the truck over the weekend.

185M to cabin one way yielded 26.8 mpg (computer calculation)
185M back home with canoe on top was 26.9-27.0 mpg

conclusion: Sharks are fast.
I want to trust the computer, but... I've yet to have a vehicle that doesn't overestimate MPG, sometimes significantly.

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-----------------------------------
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post #931 of 940 (permalink) Old 05-08-2017, 04:34 PM
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I want to trust the computer, but... I've yet to have a vehicle that doesn't overestimate MPG, sometimes significantly.
Fine. I've hand calculated it numerous times and the most it's ever off is COMPUTER minus 1 mpg, immaterial to care.
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post #932 of 940 (permalink) Old 05-08-2017, 11:43 PM
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^^^
Same as my experience...the difference is about 1 MPG. Not a big deal.

Mike
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post #933 of 940 (permalink) Old 05-10-2017, 09:58 AM
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Hello,

Just sharing my average MPGs 2017 GMC Canyon.
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post #934 of 940 (permalink) Old 05-10-2017, 05:26 PM
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Originally Posted by mmdavidson0128 View Post
Hello,

Just sharing my average MPGs 2017 GMC Canyon.
Is that a 4WD and with/without air dam?

2017 Duramax 4x4 Z71
-----------------------------------
04/20: Ordered at dealer
04/25: Accepted by GM (2000)
04/26: TPW 05/08 given (3000)
04/29: Vehicle ready to build (3300)
05/05: Order sent to production (3400)
05/13: 0946 AM, vehicle completed
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post #935 of 940 (permalink) Old 05-18-2017, 10:49 AM
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2017 2wd with airdam
DIC always reads 1-2mpg higher than hand calculated.
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post #936 of 940 (permalink) Old 05-18-2017, 11:07 AM
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50 mph for 50 some miles
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post #937 of 940 (permalink) Old 05-19-2017, 11:56 PM
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Doing 80 mph last trip Wyoming to Billings, MT best I saw was 27.3 then back home. Ended up at 25.9 here . Still happy 😊

Ordered 09/16/16, Built 10/13/16, 10/19/16 Transit to the Dealership! 10/31/16 at the Dealer. 11/06/16 Home. 4x4 Canyon SLT 2.8L Duramax short box, Bronze Alloy Metallica w/ Cocoa Dune interior.
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post #938 of 940 (permalink) Old 05-20-2017, 10:26 AM
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Last weekend coming back from StLouis I went 142 miles at 70 mph and used 3.88 gallons. Hand calculated out to 36.6 mpg.
The DIC said 36.2.
This was all interstate with a 15 mph wind hitting left rear so slight advantage with wind. But what really helped it was the pedal commander running on Eco +3. In Eco mode it really pouches the response of the throttle and I will probably never use that mode again.
Before the trip last weekend I removed the front slitter to see how it affects the mileage. Best I saw before was 34.6 without the pedal commander running about same speed.
On way down to SL the truck got 32 mpg with pedal commander off running between 65-75 all interstate.

Sorry image rotated after uploading.
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8/14/2015 Ordered 2016 Canyon diesel CCSB, SLT, Copper/Red, black interior, Bose, spray in liner, transfer case shield, bars package and block heater.
Built 1/20/2016
Dealer received 2/3/2016
I received 2/5/2016

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post #939 of 940 (permalink) Old 05-20-2017, 06:19 PM
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Originally Posted by MattFL View Post
I'm wondering how much the local area matters? I'm in S. FL and we've taken our prius on several out of state trips. Without fail, every time our mileage gets significantly better as we get farther north, and gets worse as we return home. Most of the change happens between south and north Florida. At ~75mph we start out in the upper 30's (37-38mpg), and as we leave Florida we get into the lower 40's (42-43mpg), then the exact opposite on the way home. I don't have an explanation yet, but I use cruise control and cruise the same speed all the way up, and I watch the mileage change as the miles go by. So I guess my point is, I wonder how much the geographic location affects mileage, everything else being equal.
I would guess it is probably temperature related: affecting air density/humidity. I know the jeep liberty crd I have I can see a difference in the mpg between morning and afternoon driving in California (larger temperature swings throughout the day/night than Florida) on the same route.
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post #940 of 940 (permalink) Old Yesterday, 12:40 PM
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Round trip from Mountain View to Fontana, CA and back this weekend. Saw 24mpg on the way down and 25 on the way back. MPG seems to be improving in general. But I'm pretty sure the >90deg OAT helped a bit.
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