DanielAcosta

For me it's a fun video game seeing how much time I can spend in V4. My best so far is accelerating from 15 all the way to 50 on just 4 cylinders. My instantaneous readout usually goes up about 20% when it changes from V8 to V4, so it does save some gas. With a small lift and 34" tires, 20mpg overall seems pretty good to me.

That kinda sucks. Was your low fuel light on? Mine comes on with about 2-3 gallons left, so my fill ups are always about 24 gallons, 450-500 miles to a tank. I've been getting this mileage from day one.

My runs V4 down to about 5mph, always V8 at idle. I've seen V4 as high as 80mph under light load and ideal conditions, but most of the time I need to be 65mph or less for any sustained V4 operation. It really comes down to the pressure under your right foot. I can actually accelerate from about 15 to 30mph under V4 if I barely touch the gas pedal; any extra pressure at all it switches to V8. It's almost like a video game, but it does work. Other posters with the 6.2 seem to have better results than you are indicating. There have been several ECM updates with the 5.3 I have; don't know if there are any updates for the 6.2 See my signature block for more info on my truck's specs. Good luck with yours.

That's pretty bizarre. From day 1 I've been getting 450-500 or more miles per tank, and I'm at 12,000 miles now. Do you spend a lot of time idling or warming up using remote start? Even with nothing but around town I would expect 16x25=400 miles per tank.

Sorry for all the troubles everyone is having. I drove a dozen 14 Silverados and Sierras before buying and none of them had a vibration issue. It was a good random sampling of all the different tire sizes and brands, as well as a couple with lifts and aftermarket tires. The one I bought had a lift and aftermarket tires from day one, and it is still trouble free after 12,000 miles. I sure hope you all find the fix, because this is a huge blemish on an otherwise fine truck.

FWIW my mileage did not change after all the updates.

Truxedo Lo-Pro QT for me.

Besides your dealer, Discount Tire also has the programming tool and will do it for free.

You can see a before online or at any dealer. For an after with 2 inch, look at the photos in my gallery.

What I have noticed is the voltage is higher after the truck has sat for a few days. Once the battery is fully charged, the voltage drops down. Makes sense and I like it. One of the reasons I decided to trade my 07 Tundra is the voltmeter started fluctuating for no apparent reason. When it sits at one spot for years and then starts to change, something is amiss. The dealer checked it, found no problems and said don't worry about it. I was still concerned, though, because alternator replacements on Tundras are pricey.

The Z71 also includes a different air cleaner, downhill grade assist, different shocks, etc. I wanted the Z71 package but wanted cloth with the center console more. Out of all the dealers in my area I could only find 2 with cloth and the console. There was an All Terrain (which includes Z71) that was my first choice, and an SLE non-Z71 that was my second choice. The AT was across town, $1,000 higher msrp (and worth it I thought), but also had $1,000 extra dealer add-ons I refused to pay. Therefore I ended up with my non-Z71 SLE, saved $2,000, and saved a trip across town. If I were still a hard-core off-roader I would have held out for a Z71, but I do more soft-roading now so I'll be just fine without the Z71 package.

The center console is one of the things we like the most. Searched long and hard to find a cloth interior with the center console, but we found it and bought it. The column shifter allows more options and flexibility with the center console. We took a little 3,000 mile trip and discovered that by moving the cup holders to the forward slot, the opening in the rear was just the right size to secure a half gallon of milk and large bag of potato chips. Yeah, we snack healthy when we roll. We've never seen another vehicle that could hold a half gallon of milk in the center console. So was this dumb luck or did GM design it that way? Don't know, but we like it.

I noticed drivability issues like you describe when test driving 3.08's, none with the 3.42's. There is also an ECM update that specifically addresses shifting and drivability. The dealer applied it to my truck even though I was having no problems because my VIN fit the range of those affected according to GM. Suggest visiting your dealer and telling them you'd like an ECM update for drivability. BTW, there is also a newer ECM update for the AFM. Both updates can be done at the same time, takes about an hour. Good luck.

FWIW I test drove a dozen 14 Silverados and Sierras a total of 500 miles before buying, and none of them had any vibration. Overall I was impressed with the consistency of quality control. The most negative comment I have is the 3.42 rear end drives better than the 3.08. Almost all the trucks I drove were crew with 6.5 foot bed, 5.3 4x4. The one I bought had the most test drive miles (done by me) at about 250. It had aftermarket wheels and tires, and has always been smooth. 9,000 miles and almost three months later, still zero defects. I've only had it up to 95-100 on the extraterrestrial highway in Nevada, still smooth. Hope those of you with the vibration find a fix. With so many reporting resolution from tire balance, it makes me wonder if a defect in the wheels themselves might be causing your problems. Good luck.

14 Sierra 5.3 4x4, 6.5 foot bed, Fuel 20" chrome wheels, 34" Toyo A/T II tires, matching 34" Toyo A/T II spare but on stock 17" spare wheel, small leveling kit, factory matched mud flaps, GMC branded BedRug (same as aftermarket BedRug, but has GMC logo on the back bed wall instead of BedRug), Truxedo Lo-Pro QT. The dealer had the wheels, tires (except the spare), and leveling kit on when I bought it. It drove great, and Discount Tire confirmed they were quality wheels; I had used the same tires on the 07 Tundra I traded in, so I know the Toyos are great. I added the spare and other accessories, including installation, myself. In hindsight the mudflaps were a pain to install, so next time I'll just pay the dealer to do that. The BedRug and Truxedo are pretty easy for a self installation. Sorry, but the mudflaps and Truxedo weren't installed yet in these photos. BTW, even though the mudflaps were a pain for self-installation, they look great and are a perfect color match to the stock grey wheel well moldings. The thing that made them hard to install was a special type of nutsert fastener on the front. My dealer was nice and let me borrow their tool for the job.