Gas Mileage on trip.

[scot moore]

Just want to post something I thought was funny. We took the Yukon on our first camping trip this weekend. We have heavy pop-up camper. Heavy for a pop-up around 3500# empty not counting things like Frige ac, spare and gear. So it comes in close to 5000# loaded. I say all of this because we got better MPG pulling the pop-up then we did with that carrier on the roof. [emoji3] not much but about 1 MPG better.


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[swathdiver]

Ive got a 2012 LTZ, and average around 15.8 MPG (over 70K miles). Crossing KS from Colorado, if I cruise at 77MPH, I’ll get 14, cruise at 71,MPG will jump up to 17+.

I've seen more than 17 mpg only twice and once was the day I brought it home! What kind of truck and what gears are in it Bill? Ours is a Yukon XL with 4WD and 3.42 gears.

 

[RST Dana]

I don't understand how having the rooftop carrier empty made any difference. Or am I not getting something?

did not mention if is was a hard case or soft, which could collapse a bit with less inside

 

[RST Dana]

Ive got a 2012 LTZ, and average around 15.8 MPG (over 70K miles). Crossing KS from Colorado, if I cruise at 77MPH, I’ll get 14, cruise at 71,MPG will jump up to 17+.

but who drives that slow?

 

[swathdiver]

but who drives that slow?

Me! The difference in time between 70 and 75 mph is 3 minutes for sixty miles; 51 versus 48.

 

[scot moore]

Me! The difference in time between 70 and 75 mph is 3 minutes for sixty miles; 51 versus 48.

True but I can to a lot of things in just 3 minuets [emoji41]


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[PG01]

True but I can to a lot of things in just 3 minuets [emoji41]


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Thats it huh?
Sorry

 

[kbuskill]

Thats it huh?
Sorry

As Bernie Mac would say...

" 3 minutes, that's all I got.... if she don't get hers before I get mine.... she fresh outta F'n luck wit me"

 

[Tozan]

My 4 inch lifted rig with 35 in tires and 4.10 gears. I also carry at least 150 pounds of bug out gear.

I get 15.8 on the low side lots of up and down hills or stop and go city driving and 19 on nice flat roads running 65 to 70 MPH.

Running 80 + mph in Utah I was getting an average between 16.8 to 17.5 and a 91 octane tune.

 

[Warriorpluto]

Wow you guys are getting low fuel mileage. I get 19mpg at 78mph in my yukon Denali 6.2. I get 13mpg n city. I've manually estimated my mpg since I've owned the truck and have never been able to get more than that. Stock engine, no mods. Stock tire size. I do have replica snow flake wheels which are a tad bit lighter than the oem Denali wheels I took off. Didn't really make a difference.

 

[swathdiver]

Wow you guys are getting low fuel mileage. I get 19mpg at 78mph in my yukon Denali 6.2. I get 13mpg n city. I've manually estimated my mpg since I've owned the truck and have never been able to get more than that. Stock engine, no mods. Stock tire size. I do have replica snow flake wheels which are a tad bit lighter than the oem Denali wheels I took off. Didn't really make a difference.

That's fantastic! What brand and octane of fuel are you using and where do you live? My neck of the woods is flat so there's no coasting down hills. What type and brand of tire are you running?

 

[kbuskill]

Wow you guys are getting low fuel mileage. I get 19mpg at 78mph in my yukon Denali 6.2. I get 13mpg n city. I've manually estimated my mpg since I've owned the truck and have never been able to get more than that. Stock engine, no mods. Stock tire size. I do have replica snow flake wheels which are a tad bit lighter than the oem Denali wheels I took off. Didn't really make a difference.

More importantly... what rear end is in your truck... I'm guessing 3:42s or maybe 3:08s because your mileage is better than mine at highway speeds and worse around town and I have 3:73s.

 

[swathdiver]

Denalis come with 3.42 gears exclusively, pretty sure. I figure he has a K2 and not a GMT900 as well.

 

[Mrsteef]

The wife, kids, and I go to and from Orlando/Disney all the time and I used to average around 15.6mpg. Now that I had the fuel pump and fuel pump flow control module replaced I only get around 11-14mpg. This is pretty weird because I when I had my Silverado I’d average close to 16mpg on the same trip and if I were towing my drift car on the trailer it would be around 12mpg. Seems like ever since my pump and module were changed out in the Tahoe I seem to get worse mileage.

 

[swathdiver]

The wife, kids, and I go to and from Orlando/Disney all the time and I used to average around 15.6mpg. Now that I had the fuel pump and fuel pump flow control module replaced I only get around 11-14mpg. This is pretty weird because I when I had my Silverado I’d average close to 16mpg on the same trip and if I were towing my drift car on the trailer it would be around 12mpg. Seems like ever since my pump and module were changed out in the Tahoe I seem to get worse mileage.

Is it possible they used the wrong parts? '09s like yours were rated for 14 city and 20 highway and 16 combined. At what speed did you get 15.6 mpg on the way to Mickey? Or was that an average for the trip?

 

[Mrsteef]

Is it possible they used the wrong parts? '09s like yours were rated for 14 city and 20 highway and 16 combined. At what speed did you get 15.6 mpg on the way to Mickey? Or was that an average for the trip?

That was with me driving around 80-85mph but averaged

 

[Mrsteef]

Think I may have found my issue and it’s my own fault lol. Tires were a bit under inflated. Bumped them up to 35-36psi and got this result between yesterday and today

 

[Warriorpluto]

More importantly... what rear end is in your truck... I'm guessing 3:42s or maybe 3:08s because your mileage is better than mine at highway speeds and worse around town and I have 3:73s.

I have 3.42

 

[swathdiver]

Think I may have found my issue and it’s my own fault lol. Tires were a bit under inflated. Bumped them up to 35-36psi and got this result between yesterday and today

That's good news Chris. What kind of tires and what size are you running?

My last tank of fuel averaged 13.2 mpg on E85. My truck has always seemed to get better mileage on E85 than gasoline, not that E85 will deliver higher numbers, just not too much lower than gasoline. I'll run another test on gasoline when the prices come down. I like paying $2.29 a gallon for racing fuel!

 

[Mrsteef]

That's good news Chris. What kind of tires and what size are you running?

My last tank of fuel averaged 13.2 mpg on E85. My truck has always seemed to get better mileage on E85 than gasoline, not that E85 will deliver higher numbers, just not too much lower than gasoline. I'll run another test on gasoline when the prices come down. I like paying $2.29 a gallon for racing fuel!

My truck will be about 2mpg less on e85. The truck is on the factory 20” wheels with 275/55/20 Hankook dynapro HT’s