I just bought a used 2010 silverado cc 4X4 with the 6.2 with 80K miles. It's completely stock besides a mit tube and air filter.

I can only hit a 0-60 time of about 7 seconds...I use 91 gas and I am also at an elevation of 4300 ft, but does that make much of a difference?

I see videos of other 6.2s on youtube and even ecoboosts running a 6 ish and even new 6.2s running sub 6.

I have new plugs/wires and just cleaned throttle body, truck has no CELs. Am I making something out of nothing?

 

elevation makes a huge difference

 

I would also say elevation. My 2007.5 NNBS ECSB 4x4 LTZ 5.3/4 Speed stock at 2,000 ft above sea level, 80 degree day running 91 did 7.3 seconds 0-60.

You should be able to run low to mid 6's stock.

I do know that GM did some 0-60 times on the 2016's. A 2016 Crew Cab Standard Bed 4x4 LTZ with the 6.2/8Speed, 3.42 gears (Max Tow Package), Truck weighed in at 5600 LBS ( Heaviest configuration on a 1500) and it ran a 5.6 second 0-60. Obviously this is in perfect conditions but still damn fast.

 

Its elevation ask me how i know being at 6000+

A friend of mine bought a stock trans am almost at sealevel, testing it he found out he had no traccion at all and would need better tires and what not, he drove it here and car wouldnt spin a bit from the start lol i could tell u hundreds of sad stories like that

 

Elevation kills power.