31 MPG is this for real? 2017 6.2 Denali

[tnchevy]

I keep a spread sheet of hand calculated mpgs' for my 2014 5.3 with 3.42 rear and will have the truck for 3 years at the end of next week. I have not towed and my driving is more 55 mph county highways with 25% interstate and 25% town and after 3 years I am at 19.8 mpg with an avg summer mpg's of 22 mpg and winter mpg's of a little over 17. The best tank I ever got was 25 mpg driving down the from the mountains to the SC coast but got 21 mpg's on the way back. Worst tank was middle of winter with probably a lot of 4wd and town driving at it was 15 mpg. All this on 87 octane and front air dam removed 2 years a go. As a comparison my 2002 with the 4.8 and 4.10 rear had a 12 year average of 18.8 mpg.

[wildlyfe200]

I keep a spread sheet of hand calculated mpgs' for my 2014 5.3 with 3.42 rear and will have the truck for 3 years at the end of next week. I have not towed and my driving is more 55 mph county highways with 25% interstate and 25% town and after 3 years I am at 19.8 mpg with an avg summer mpg's of 22 mpg and winter mpg's of a little over 17. The best tank I ever got was 25 mpg driving down the from the mountains to the SC coast but got 21 mpg's on the way back. Worst tank was middle of winter with probably a lot of 4wd and town driving at it was 15 mpg. All this on 87 octane and front air dam removed 2 years a go. As a comparison my 2002 with the 4.8 and 4.10 rear had a 12 year average of 18.8 mpg.

What would you attribute the lower mileage in winter time too. Winter gas, using 4wd?

 

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[Thomcat]

Oil life is just keeping track the percentage of how many miles are left out of 7,500. Not really and actual indicator of oil life but it does it's job.

 

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Modified - misread quote

 

I disagree that Mr. DICk doing his job and agree fixed mileage is more desirable than relying on that "engine killer" although a 7,500 claim is more for advertising hype than ideal engine life. DICk's information for calculating mileage is fed by a complex algorithm that is based on some but not all real world parameters dictated by monitoring the engine sensors. Likely written by programmers in foreign countries that commute on bicycles working with the crap data GM gives them to achieve an outcome more conducive to their competitive advertising claims than for engine life past the warranty period And when that doesn't work out, increase the 5.3s sump size from 6 to 8 quarts and get a boost in oil life.

 

I change my oil based on mileage set and monitored on Trip2 of the odometer and leave that dumba$$ DICk to do what it wants with no reset unless it triggers a warning. Over 9,500 miles before the "engine killer" finally indicated I had 10% remaining before I reset, or sooner if I I get an annoying message. If Mr. DICk is so damn smart how come he can't tell that the service monkey for the last few changes at one place put in the wrong viscosity oil and merely cleaned off the oil filter with a rag instead of changing it; at another place overfilled with correct oil and wrong filter; at another didn't even change the oil or filter before resetting Mr. DICk?.....because absent sensors to input the incomplete algorithm there is no way to determine that due to faulty servicing the bearings and piston rings are wearing at an abnormal rate.

[tnchevy]

What would you attribute the lower mileage in winter time too. Winter gas, using 4wd?

 

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All of my vehicles get worse mileage in the winter than they do in the summer. The winter gas I think plays a big part plus fluids take longer to get warmed up etc.

[Nanotech Environmental]

All of my vehicles get worse mileage in the winter than they do in the summer. The winter gas I think plays a big part plus fluids take longer to get warmed up etc.

It's also the denser air. The trucks have to work a little harder to push thru cold air vs. warm air. They also have longer warmup times which uses more fuel as well.

[Ozer]

I keep a spread sheet of hand calculated mpgs' for my 2014 5.3

If you have a smartphone get the app FuelBuddy, its hand calculated data but you're able to see charts and such as well as you enter data.

[wildlyfe200]

Good call I'll check it out

 

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[clayp]

You guys must all drive like grannies. My 5.3 might hit 20mpg avg once a year on the freeway and mixed city driving I'm at 14-18 tops. The BFG All Terrain K/O tires hurt it a bit compared to the original Goodyears

[BIGDOGx]

Same here best i can do with real highway driving in my 6.2 is around 21-22mpg. To hit 30 would take a unrealistic scenario like hitting a 30 mile stretch of road that is all downhill or something to that effect.

[truckguy82]

Same here best i can do with real highway driving in my 6.2 is around 21-22mpg. To hit 30 would take a unrealistic scenario like hitting a 30 mile stretch of road that is all downhill or something to that effect.

60mph cruise with a few stops for tolls etc, I'm definitely hitting 25mpg.

 

21-22 mpg is like 75-80mph cruise, aka real interstate speed, which is bonkers it's still that efficient. My old tahoe, which was a much smaller vehicle, would drop like a rock in efficiency beyond 70mph

[Mark Diedrich]

60mph cruise with a few stops for tolls etc, I'm definitely hitting 25mpg.

 

21-22 mpg is like 75-80mph cruise, aka real interstate speed, which is bonkers it's still that efficient. My old tahoe, which was a much smaller vehicle, would drop like a rock in efficiency beyond 70mph

[Mark Diedrich]

If your doing 60 on the interstate, get the heck off and drive the back roads, you are going to cause an accident driving that much slower than the "flow" of traffic....

[truckguy82]

If your doing 60 on the interstate, get the heck off and drive the back roads, you are going to cause an accident driving that much slower than the "flow" of traffic....

Nobody is doing 60 on the interstate, I meant like some 55mph road.

[Mark Diedrich]

Gotcha, when you said a few stops for tolls, I thought interstate, and to me it's not worth driving slower in that situation just to try to get some better mpg, while possibly being involved in a high speed wreck from somebody else not paying close enough attention....

[truckguy82]

Gotcha, when you said a few stops for tolls, I thought interstate, and to me it's not worth driving slower in that situation just to try to get some better mpg, while possibly being involved in a high speed wreck from somebody else not paying close enough attention....

 

I agree, I got into a little disagreement on here about that, some guy was saying the speed limit is always the safest and I was saying following the flow of traffic is the safest.