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  #11  
Old 02-28-2020, 01:12 PM
peter8 peter8 is offline
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I had a 2010 6.2 max tow pkg (81,000 miles) and now have a 2017 max tow pkg (29,000 miles). I have only run 87 octane in them except for the 1 time in each truck when I tried a tank of premium fuel when towing on a long trip. The mileage was not effected at all. It did increase MPG when towing with my 5.3. I own a 2017 with a 5.3 also. The best 50 mile mpg is 25.1 with the 5.3 short bed regular cab. The best mileage with the 6.2 crew cab long box is 28.4 mpg. Both when empty of course. Towing my Lund 219 700 miles back from Mobridge last year I averaged 15.5 mpg. That is better than I ever got with the 2006 Duramax I had when I pulled my 193 Warrior on the same trip. The 6.2 is a fantastic motor. My 17 has the 8 speed tranny and the 5.3 has a 6 speed.
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  #12  
Old 03-03-2020, 07:43 AM
UKBDM UKBDM is offline
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Default Fwiw ...

My dad (now 80) put 92-93 octane fuel in his cars my whole life. He had two different Buick Roadmasters in the late 80's - late 90's that both went over 400k miles. He has always driven cars over 200k miles and has had 4 over 300k miles.
Obviously its maintenance and the fact he drives a lot of miles per year but i think premium fuel plays a role as well.
Most of of us in this day and age don't want to drive a car that long ... we are spoiled.
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  #13  
Old 03-28-2020, 01:03 PM
Chadx Chadx is offline
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Premium gas is recommended for the 6.2L and you have to run it to get the rated hp and gas mileage. You can run regular, but the computer will make adjustments in timing, etc. and you will be down on hp and mileage. I hate when the recommended fuel is premium and won't buy such an engine. To each their own, though.

As for running premium in an engine not designed for it, like the 5.3, it is a complete waste of money. No better performance or mileage and does zero for engine longevity.
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  #14  
Old 03-31-2020, 09:30 AM
Muskeye Muskeye is offline
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Default GM 6.2 liter

I have a new Cadillac Escalade with a 6.2 liter and a 10 speed. Not exactly the same but very similar. My earlier tow vehicle was a 2010 Chevy Silverado with a 5.3 liter. I run 93 octane in the Escalade. The book says the engin will run better and get better mileage with higher octane fuels. With that said, I can say there us a huge difference in towing my Ranger 621 with this truck. Because of the current pandemic I have not yet taking a road trip pulling my boat but the limited testing I have done was awesome. I expect to be able to pull a loaded boat up hill without hardly noticing the weight. The 6.2 was a great upgrade.
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  #15  
Old 04-01-2020, 09:10 PM
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David Anderson David Anderson is offline
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Run an '18 GMC Sierra 1500 with a trailer package, 6.2L. Pull a 620FS in summer and a 8 x 20 single axle wheel house in winter. I have never put in premium but some day I will try to see if there is any improvement as gas is pretty cheap these days. I get around 13 mpg pulling the boat, maybe 10 mpg pulling the wheel house depending how fast I drive. Last June drove to Sioux Lookout with the truck, some gear, no boat, and 1 passenger and for the 1000 mile round trip did over 25 mpg. Best in the 25 mile setting is 30.7, at the 50 mile setting is 28.5, and the 400 mile setting is 25.4. Bought the truck in December of 2017, runs great, no knock, and has good power. It would have to be a big improvement if I were to switch to premium gas.
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  #16  
Old 04-02-2020, 11:55 AM
egladding egladding is offline
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So I have been running 89 octane in the truck and haven't noticed any issues or engine abnormalities. My average mpg's on the gauge says 13.7mpg over 50 miles. I do start the truck still before I go anywhere to warm it up. I check my onstar app sometimes and it tells my what my driving score is from the last trip and gives average speed, mpg's etc. It normally says I am getting at least 17mpg while driving. I am pretty happy with 17 mpg normal in town driving. I will test it when I get the boat out in the next week or so.
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  #17  
Old 04-20-2020, 07:17 AM
sdwalleye621 sdwalleye621 is offline
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Quote:
Originally Posted by David Anderson View Post
Run an '18 GMC Sierra 1500 with a trailer package, 6.2L. Pull a 620FS in summer and a 8 x 20 single axle wheel house in winter. I have never put in premium but some day I will try to see if there is any improvement as gas is pretty cheap these days. I get around 13 mpg pulling the boat, maybe 10 mpg pulling the wheel house depending how fast I drive. Last June drove to Sioux Lookout with the truck, some gear, no boat, and 1 passenger and for the 1000 mile round trip did over 25 mpg. Best in the 25 mile setting is 30.7, at the 50 mile setting is 28.5, and the 400 mile setting is 25.4. Bought the truck in December of 2017, runs great, no knock, and has good power. It would have to be a big improvement if I were to switch to premium gas.
I had a 2016 and a 2018 and got mpg numbers comparable to yours. I've now purchased a 2020 chevy with the 6.2 and my numbers are not that good. Pulling my boat 10 to 11 and empty 18 to 21. Nothing like I had become use to. I know of others who have said the newer GM pickups with the 6.2l v8 don't get the mileage the 2018s did.

Still a great motor, has huge power and pulls very well.
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  #18  
Old 06-01-2020, 12:44 PM
Muskeye Muskeye is offline
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Default GM 6.2 liter

I run 93 octane all the time with my truck. It's a 6.2 liter Cadillac Escalade with a 10 speed. I just got near 14 mpg pulling my 621 at 75+mph for a long trip. I get over 18 mpg when driving on the highway at 80 mph. Much better than my older 5.3 liter Silverado. Can sure notice the difference when going up hill with the boat on the back.
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  #19  
Old 06-01-2020, 01:22 PM
thawk9455 thawk9455 is offline
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As much as I love GM trucks and SUVs, they're doing an excellent job of pushing me toward Ford lately. I've eagerly been watching the new Tahoe figuring there was good chance that could be my next vehicle (they're finally fixing it so you can put the max towing package on the Z71).

But in typical GM fashion, they're finding fun ways to screw it all up.

2021 Tahoe gets worse gas mileage (it can be better in the city, but worse highway) than the outgoing model. 16/20 for the 4x4 (and I think 15/19 for the Z71). Never mind the 4x4 Expedition gets 17/22 (I believe even with the FX4 package).

2021 Tahoe is 6.7" longer than the previous model, if I wanted it bigger, I'd buy a Suburban. But we had to make it bigger because the Expedition was bigger (the new Tahoe is .7" longer than the Expedition). The new Tahoe is 8.4" shorter than a 1990 Suburban was.

And the fun fact related to this thread. If you put the 6.2L in it for better towing, it actually reduces the amount of weight you can tow with the max towing package. So if you want the maximum amount of towing capacity you actually are required to get the smaller engine...
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  #20  
Old 06-01-2020, 08:57 PM
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RMBin303 RMBin303 is offline
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Quote:
Originally Posted by thawk9455 View Post
As much as I love GM trucks and SUVs, they're doing an excellent job of pushing me toward Ford lately. I've eagerly been watching the new Tahoe figuring there was good chance that could be my next vehicle (they're finally fixing it so you can put the max towing package on the Z71).

But in typical GM fashion, they're finding fun ways to screw it all up.

2021 Tahoe gets worse gas mileage (it can be better in the city, but worse highway) than the outgoing model. 16/20 for the 4x4 (and I think 15/19 for the Z71). Never mind the 4x4 Expedition gets 17/22 (I believe even with the FX4 package).

2021 Tahoe is 6.7" longer than the previous model, if I wanted it bigger, I'd buy a Suburban. But we had to make it bigger because the Expedition was bigger (the new Tahoe is .7" longer than the Expedition). The new Tahoe is 8.4" shorter than a 1990 Suburban was.

And the fun fact related to this thread. If you put the 6.2L in it for better towing, it actually reduces the amount of weight you can tow with the max towing package. So if you want the maximum amount of towing capacity you actually are required to get the smaller engine...
If you are really concerned about MPG, dig a little deeper before you jump into an Expedition. I have a 2019 Ex Max. Great vehicle. Love the engine and tranny. But the MPG leaves a lot to be desired. Highway is more like 18. City 15ish. I got 9.5 MPG towing my 7000 pound wake boat 180 miles on mostly flag ground at 65 MPH Sunday.
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