JCthebigTree

'best' is in the 55-60 range. With the big differences in temps the last couple weeks its hard to really be sure...but with this "warmer" weather (high of 5f here today!) I'm seeing around 18 at 55... I played around a bit yesterday and noticed the following. pinned at 55 on flat stretch, I get better mileage at M5 than at M6 or D... Going 55, it definitely drops into 6th when I go from M5 to M6 or D, so I'd assume that would get better mileage - not according to the DIC. Also (and this needs more experimenting) I noticed that when it did manage to drop into V4, the mileage gets worse...but if I'm in M5 it drops in much less. Over the last 100 miles, with the warmer weather/less remote starts, I've seen my around town MPG improve (on the DIC) from about 10 to just over 13...I'll take what I can get.

Almost, but not quite, as perfectly seemless as my '07 Yukon. Only thing is, when paying attention on a long (9 hour) highway drive, it barely ever kicks in on mine...unlike some, I'd like it to improve my mpg. Basically had to get on a long downhill for it to kick in, on m '07 Yukon it would kick in on every flat stretch. Seems like it get back into V8 the instant I need it too...so no real complaints.

Just put 1,200 miles on... now up to 2,300 or so total... Cruise for most of the trip varying from 74-79 so as not to peg it at any one speed for too long. 400 mile average is 15.1 - 'best' is 18.9 Questions: - How is 'best' calculated - I know at a couple points I was getting better than 18.9 for an extended time. - 15.1 at an average of 75 seems really low for a vehicle that's rated at 22 highway - I know its cold and its winter gas, but it shouldn't be knocking that many miles per gallon off, right? My '07 Yukon with 150K on it was running better milage than this truck...not the end of the world, but expected better by now.

First time I got up to speed in my AT Sierra w/ 20" Goodyears I had vibration...2nd time I had a little less vibration. Last time I got up to speed I didn't notice any vibration. Putting 1,500 miles on over the weekend through New Years, will have plenty of time to see if I have vibration and if I do whether or not its just snow or ice in the wheel...

This last tank I'm showing an average of 9.4 Taking into account remote starts, about 300 pounds of weight in the bed, crappy weather w/o 4 wheel, and driving on a lot of hills, and only 800 miles on her...I'm still feeling like it should be better than single digits.

its going to break in damnit! Having not noticed it on the way back, I'm hoping I just had some ice frozen in one of the front wheels...

'14 Sierra AT w/ 20" wheels. 670 miles now. Finally got it on the interstate saturday, cracked 70 and the front end & steering wheel vibrated quite a bit getting worse up to 80 but never went faster. The return trip yesterday was hampered by weather, but the couple times I was over 70 I didn't notice the vibrations as much - hoping the front end just needed to break in a bit. Have other issues that the dealer needs to work on, going to get it out again before I take it in to see if the vibration comes back...hopefully it doesn't come back.

It was -10 (without wind chill ) this morning after 3 days of getting pummeled with snow...We got about 30" and up the shore they got around 42"... That being said, I'd rather have this than freezing rain. Needless to say, I ran the remote start twice this morning and it was still a bit nippy - my appreciation for the heated steering wheel is immense. I'm giving the block heater a whirl tonight - never used it on any of my vehicles, even in NoDak with -35 temps, but I think this one deserves a little pampering.

I use the OnStar app a bit too, but mainly because of the novelty of starting my truck with my phone... My ramp is across from my office building and down the block, with my old truck I had to walk down the hall to conference room to get close enough, now I can do it without leaving my desk... Quicker than having to go through to the app, punch in my my pin, hit 'ok' to 'only use remote start where legal & safe' prompt (which I don't get, is remote start not legal in all states?)... Just easier, though not as cool, to use the fob. Best use I know of for the app is when you're flying back home in the winter and you can start your truck from the tarmac or terminal.

I'm finding this remote start to be better than on my old '07 Yukon... The one difference is that the Yukon would be 'warm' when I got in after two cycles, while the Sierra really isn't all that warm just getting in...BUT the second you turn the key there is a lot of hot air ready for you if you want it...the Yukon never had hot air ready. The Sierra does fog up more during remote start, especially with snow on the windshield, but I have some RainX Fog wipes I'm going to try. I'll also say this, the fob remote start has a hell of a lot more range than in my old Yukon.

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...

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.