Hey guys, I learned the trick of pressing in the button to see engine hours. My truck is a 2001 2500HD with the vortec 6.0. A family member bought in new in 01 so I know it's never been tampered with. It has 109,000 miles and the hour meter reads 4397.5! Seems like a lot. Then, my buddies truck is an 04 vortec 5.3. It has 140,000 miles and 2844.8 hours. That to me seems right. Average speed works out to 49 miles per hour. Here's the kicker. My grandma (haha I know, grandma) has a 06 2500HD with the vortec 6.0. It has 131,000 miles and only 935 hours! That can't be right! That places her average speed at 140 mph. My dad bought the truck brand new and then sold it to her years later, so again, I know it was never tampered with. How can this be? They have to be messed up. I think my friends 5.3 sounds right but the hours on my 01 are way high and the hours on my grandmas are way low! Thoughts?