2014+ Gas Mileage (MPG) Topic

ktreece · December 4, 2013

From Oklahoma, Hmm.... that was a real adult comment. I'm not from Oklahoma, but I do live here.

If you posted 20-22, that's believable. Not 27.

Mike

i'll tell you guys soon as I leave Weatherford, Ok and head to Arkansas. Straight shot. Couldn't ask for better conditions for MPG. But then again it will be it's first trip so might not be that great.

JCthebigTree · December 4, 2013

200 miles on mine and I'm barely cracking 13 mpg - I'm chalking this up to winter, remote start usage, and new truck...that and its all hills here, plus the last 50 miles or so have all been in a foot of snow & auto or 4.

Hoping it gets a lot better though.

dagwood2001 · December 4, 2013

I am still at 14.2, even with the download so no improvement whatsoever. mix of city and highway. When I had the download done, was told by the service tech "well it is a heavy truck". Um, thanks. I'm still under 3,000 miles so I am going to give it some time.

TJay74 · December 4, 2013

I hand calculated my new AT with the 6.2 motor this morning. I had 110 miles on the tank, DIC showed 17.9mpg and hand calculation was 15.01mpg. I am not worrying about mpg until the motor gets 3000-5000 miles on it. Either way still better than the 2010 5.3/AT this truck replaced and a lot more power/fun factor as well.

Willc11 · December 5, 2013

Last week, I took my 2014 Denali to Austin to see my sister for Thanksgiving. I left on Wednesday, and took I-35 from Ft. Worth to Austin. After some traffic bottlenecking and some 55-75mph driving, and some length stops idling, I achieved 22.4 mpg. The truck was 2/3rd's 87 and 1/4 93 octane. Trip started with 86 Miles on the truck.

On the return trip, toping off with 93 octane and no stops, alternating between 68-75 miles per hour, the result was 22.6mpg.

I am very impressed. No tail wind on either trip. My 2011 Denali would get 17.5 at best. Gotta love AFM!

Will

KUUG · December 5, 2013

I'm getting 20-23 mpg highway as long as I stay around 70 mph. 75 mph + I get about 17-18 mpg.

In the city It drops significantly; I'm usually around 15-16 sometimes 14.

My dad bought the same exact truck as me after seeing mine and he is getting around 14.5 city. He has never hit above 20 mpg to my knowledge, even on a road trip. I have a much heavier foot than him so it doesn't make since at all

Also I'm sitting at almost 11k miles and mpg has been consistent throughout. My dad is probably still under 4k

Edited December 5, 2013 by KUUG

Swazimoto · December 5, 2013

My first 50 miles gave me an average of 8mph and that was babying the pedal. I hope after a few tanks she learns my habits and improves.

White LTZ · December 5, 2013

Fuels blends will vary from season to season. Colder months are blended with a higher vapor pressure. It also varies depending on your area of the country and the environmentally mandated requirements for cleaner fuels. Therefore the vapor pressure will differ form one area to another even in the same season.

As for JL83's 27+ mpg, I actually find it plausible if you were able to maintain the same driving conditions for an extended period. I filled up last night and reset the DIC. I drove 11 city miles while not traveling over 45mph and had to stop for a short time at 4 lights. I was showing 27.3mpg when I parked in my garage. There's no way that most people will be able to keep doing that but it's possible.

JCthebigTree · December 5, 2013

Is it possible that the computer is inaccurate?

I went down one of the few plowed & flat stretches of road here yesterday and reset 'Trip A'

I set cruise to 33 and got, according to the instant calculation about 24.3 mpg for about 13 miles. But, the 'high mpg' was only showing about 14.2 and the average was 11.4 - If I was getting 24.3 for pretty much the whole 13 miles, wouldn't the high & average be right around 24?

I filled up yesterday, so I'm going to keep track, but all of the snow driving yesterday and this morning are going to throw off hand calcs...

White LTZ · December 5, 2013

Yes, the computer could be wrong. I got the 27+ by using "Trip A". I did not check the other fuel economy screen. I have noticed that the two do not always agree.

TJay74 · December 5, 2013

The computer calculate mpg will always be off, it is basing it off of the fueling calculation that runs the fuel injectors. Hand calculations is the only way to be accurate.

redwngr · December 5, 2013

The difference is as likely to be differences in how fuel the tank is on the 2 refills.

schultzy1957 · December 5, 2013

I think everyone here is getting way off track here.

The question I asked was.....Did any one else have the same problem,....was getting approx 22 mpg

and then took it in for a recall and NOW get's 14 mpg.

ANYWAY

GM saw the post and is going to look into it deeper.,I will post what they come up with.

(P.S. I brought this to GM's attention before and they blew me off!!!!)

mzodarg · December 6, 2013

P.S. I brought this to GM's attention before and they blew me off!!!!)

Imagine that~!

GMCustomerService · December 8, 2013

I am still at 14.2, even with the download so no improvement whatsoever. mix of city and highway. When I had the download done, was told by the service tech "well it is a heavy truck". Um, thanks. I'm still under 3,000 miles so I am going to give it some time.

Hey dagwood2001,

Be sure to keep us posted of any changes. We are here to help, if you would like us to look into this for you just send us a PM with your name, contact information, VIN, current mileage, and preferred dealership.

Sincerely,

Jonathan A. (Assisting Jennifer)

GM Customer Care