Last i was told, the AT4 is the most coveted of all the Sierras. You will get a discount but not nearly as much as the other Sierra trims. One salesperson told me they aren't selling a lot of Denalis because the AT4 took it's place as the "premier" model and most people now don't fancy chrome as much as they used to. Take that for what it's worth.
Happened to me today for the first time. Truck was already warmed up. I stopped at a store, got back into the truck, started it no problem, put it into drive and it dies. I'm gonna shrug it off as a one off until it happens again.
The 21 highway mpg i'm referring to is on the low end. Obviously this is affected by multiple things such as vehicle speed, wind speed and direction, vehicles in front, etc. If i get tailwinds, highway usually averages around 23 mpg and can go as high as 25 mpg. This is also hand calculated and not what's reported by the computer which on my truck over-counts by about 0.5 - 1mpg. Picture below is my best mpg attained over 60 miles (hand-calculated will be at least 24 mpg).
You can fix the 6.2 silence with a catback system. At this point, there are plenty available. I myself have been very happy with the Gibson but plenty here have been equally happy with the Borla. Other choices besides those 2 are available.
Same torque as the 6.2 but less power. However, since the diesel has a turbo, the torque comes very early so it will feel more responsive than the 6.2 off the line. The 6.2 wins out in the end though because of the significantly higher horsepower. With that said, the diesel mileage is a tad disappointing i must admit. I get 17 mixed and 21 on the highway pretty consistently in my 6.2 AT4.
Stumbled unto an interesting msn piece. I know a member here recently had their '19 T1 stolen. https://www.msn.com/en-us/autos/news/americas-most-stolen-new-cars/ss-BBWY3GN?li=BBnb7Kz&ocid=mailsignout#image=25 Cause for concern or is this blown out of proportion? If it is cause for concern, anyone taking extra steps to prevent this besides the usual keeping it locked and parking in "safe" areas?
Wow, very shocking and quite unbelievable. If all this is true, i wonder why they are still around. Surely all the litigation must have sunk them somehow. Now I'm really scratching my head why GM dealers are directly offering it. Surely them must have done their homework. http://gmauthority.com/blog/2019/11/hennessey-goliath-silverado-and-sierra-available-to-order-at-gm-dealers/
It's interesting they are not upgrading the transmission for the 700-hp variant. Didn't think the stock 10-speed could handle that much power. Maybe the 3-year warranty puts any concerns at ease. I'm a simple man. I want just the power without the exterior upgrades. http://hennesseyperformance.com/vehicles/gmc/sierra/hennessey-goliath/ http://hennesseyperformance.com/vehicles/chevrolet-2/silverado/hennessey-goliath/700-hp-upgrade/
It's not coming from the belt or exhaust flappers. Multiple people have reported this and it seems to only be happening with the 6.2 w/ 10sp. I experience it too. Some mornings are worse than others. I think it's coming from the 10sp transmission. There is a lengthy thread no this.
Had this for a while, same as others. Seems to be only affecting the 6.2 with 10 speed. I'm almost certain at this point the chirping is coming from the 10-speed. Try this test, when you cold start it, put it in drive right away and press the accelerator pedal very lightly, the chirp will be a bit louder.
Calm down fellas, lol. I have no doubt you are both well versed in your areas of expertise. There is another solution to this, a mechanical/structural one. After all, this is a mechanical/structural problem. Some of the bass frequencies from the front speakers is hitting the resonance frequency of the plastics in the door. This is the reason why the really bad vibrations and rattles only occur with some songs. I'm guessing GM's electrical and mechanical engineers didn't talk to each other when they were designing this. Anyways, you should be able to dampen these frequencies with maybe different rubber grommets where the speaker mounts to the doors so very little of it gets carried to the doors. This solution should retain all the sound. This is how i intend to fix it on my end whenever i find the time. My 2 cents.
Aight, here you go. Install is easy. Clips can be a bit hard to get on. As i mentioned in the prior post, it installs over the factory mud-guards. The fronts use replacement longer screws (included). The rear re-uses the factory screws which seems odd but the fit seems tight. Definitely much bigger and taller than the factory as you can see in the pics.
The mpg will improve with mileage. When i first purchased my truck, i couldn't get better than 15mpg which sounds like what you are currently experiencing. I'm a shade under 4k right now and i consistently get 17 mpg in mixed city/highway. On my last road trip which included a highway stretch of over 250 miles at 70mph+ with a ton of slow-downs, i averaged 23mpg. Pic below. One thing to keep in mind is trucks are not very aerodynamic and the drag takes a bad turn when you go over 70 mph. One thing you can do to help is install a hard tonneau cover if you don't already have one. AC on/off makes no difference when on the highway. I'm actually seeing lower mpg in the cold weather without AC than i did in the summer with AC.
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