2014+ Gas Mileage (MPG) Topic

[sicsixxx]

You all get good mileage. My 5.3 gets 10 mpg. All city driving in the winter with remote start warm ups. Mileage has been the same since day 1. My dealership tells me its normal.

 

I only have 1200 km or 745 miles on my truck so I hope things get a little better.

[rudapa]

I've noticed mine is "cold" sensitive on mileage. It drops 2 MPG when the temps drop into the teens. It is also really sensitive to different gas. I just filled up in Rockwood and my mileage on this tank immediately dropped from 19.8 avg on the last tank to 17.6 on this one driving the same roads - wierd.......

Edited December 26, 2013 by rudapa

[bladz1454]

You all get good mileage. My 5.3 gets 10 mpg. All city driving in the winter with remote start warm ups. Mileage has been the same since day 1. My dealership tells me its normal.

 

I only have 1200 km or 745 miles on my truck so I hope things get a little better.

They said it was normal to get half the rated mpg?

[BillWho]

Merry Xmas Bill and everyone else too.

 

Someone really smart once told me that the way to gauge engine value is how much HP to fuel usage it makes. If the 4.3, 5.3 and the 6.2 all use 3 gallons a hour to produce 100hp you should get the same economy if all the engines push a equivalent truck. That's why I look for charts showing gals/ torque/hp. They aren't around or make such charts easy to find for some reason.

Here is a link that gets way down into the technical weeds. http://www.autospeed.com/cms/article.html?&A=112611

I did not understand the vacuum "energy cost" aspect until reading the link and can now see why cylinder deactivation makes even more sense. By the way, the Atkinson cycle motors Toyota puts into its hybrids manages the "intake" stroke so as to reduce the vacuum energy cost.

[finn5033]

Why do they drop the mpg rating for the 4x4 models? I understand that if you are in 4 wheel drive the mpg will be worse. But if you are in 2 wheel drive cruising on the highway why should the mpg be any different than a 4x2 model. Does the weight make that big of a difference?

[TJay74]

Prob because you are still spinning the transfer case which is another parasitic loss.

[finn5033]

Prob because you are still spinning the transfer case which is another parasitic loss.

 

Ok, I figured that might be the case.

[chuckl1218]

I've noticed mine is "cold" sensitive on mileage. It drops 2 MPG when the temps drop into the teens. It is also really sensitive to different gas. I just filled up in Rockwood and my mileage on this tank immediately dropped from 19.8 avg on the last tank to 17.6 on this one driving the same roads - wierd.......

On one of the threads there were some claims that 89 octane got better gas mileage than 87. Also stock air filter was better than oiled (K&N) types or dry synthetic for gas mileage although they improved other attributes of air flow. Perhaps different gas attitives affects mileage as well?

[svtkidd23]

People getting 20 every thread..show proof... Of the onstar app.. that keeps the lifetime mpg..

 

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[White LTZ]

Additives such as Chevron's Techron are just detergents. All gasoline is required to have a minimum amount of these additives although the bigger names use more (Chevron, Exxon, Conoco, Shell) as opposed to the discount stations (Racetrack, Cracker Barrel, Circle K, etc.). The amount is very minimal, around a cc per gallon. I would think it would be no effect on mileage. Octane and ethanol could definitely affect mileage.

[tenx82]

Seems to me you couldn't expect much better. The combination of only a 1.5 mile one-way commute, winter fuel, majority city....it seems you couldn't get much better no matter what you were driving. And I don't know if you're starting it up and letting it warm up every morning, but it seems that would also contribute to lower-than-expected mileage. I wouldn't be disappointed.

 

I let it warm for about one minute when I leave for work. I'm not upset or complaining about the fuel mileage. I was just hoping for a little better. But, like I mentioned, there are several things that I think are contributing to my mileage. I'll be happy if it eventually averages 17-18 in cold weather and 19-20 in warmer weather.

[blckthree]

That 20mpg figure included 400 miles with a 24-30mph tailwind which was getting me about 22.5mpg. I thought it would be less than 20mpg.

 

 

Mike

Edited December 26, 2013 by blckthree

[svtkidd23]

That's damn good.. mines not impressive

 

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[mike94silverado]

Fuel mileage is so dependant on so many factors but I have yet to have a vehicle where it fluctuated that much in the same driving conditions... And sorry you had to experience GM customer "service" my service advisor has been quite rude to me since I "tattled" to them on him and I guess I don't blame him.... Hope it ends well for you

 

 

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[Imcrazy]

Ok, we've got about 2200 miles on the clock.

Last 400 miles 17.5 mpg

Last 50 miles 19.5 mpg

Last 25 miles 17.8 mpg

 

This is almost exclusively rural-suburban roads 25mph - 50 mph speed limits.

 

I did some highway running about two weeks ago and got about 23 mpg on a 25 mile round trip.