My 3 tests were something like 9, 10.3 and 10.5 seconds. This was according to Torque app, which I kind of suspect may have been using GPS and the roads ...

My 3 tests were something like 9, 10.3 and 10.5 seconds. This was according to Torque app, which I kind of suspect may have been using GPS and the roads weren't perfectly level or straight which messes with GPS.

Black Bear Tune, AIRAID MIT, 31" tires and a heavy truck. Elevation somewhere around 2400-2600ft I think. I would say the 10 second times were closer to "real" if anything.

ThaDoubleJ wrote: I'm not kidding about all the Silverados out here. Guy on the corner has one, guy next door has one. Guy other next door has one. Guy across the street has one. 2 guys at work have them. My office still has one. My brother has one. You have one. Everyone in this thread has one. Everyone on this forum has one.

What does your brother's truck run?
What about the other guys?
6.0L or not can be a good baseline to see how those compare to what the testing says from various sources.
Your truck is in fact slower because of the altitude and all the test results you are seeing are also not at your elevation obviously. If your brother say he has a 5.3L and it runs about the same times as your truck then there is nothing wrong with your truck and you have your answer. I wouldn't expect a lot of gains with mild mods on such a heavy vehicle especially in just 0-60mph as the measurement.