I know that before the 3.73s and with the 20s my truck was dialin in 16s here in WA. I have no idea on alt. in Spokane, WA (where we run)

 

My truck ran 16.8 and it is a 5.3 standard cab, when it was stock. Vegas at 88 degrees 2000ft elevation. My best run out here now with $2400 in engine mods and a 4.10 gears, Caltracs, and Eaton is 15.3, which is about a 14.9-14.8 at sea level.

So you running a extra cab with heavy *** 20s and at 3500 ft, that aint shabby at all. Just compare your truck to guys running stock mustangs and what not. Hell I have seen two stock Z06 corvettes run 13.4 to 13.6 here in Vegas, and they are supposed to do 12.7 quarters. I see anwhere from .5 to 1 second time differences between cars running here and in california. My 95 Mustang Gt was supposed to be able to do 15.4 according to Motor Trend, and my fastest ever here in vegas was 15.77, but I ran it in cali,(forgot the track name) and got a 15.2 with it on only one run!

Calm down you got a normal truck like everyone else! Altitude is a major killer of power, same with temperatures.