Sure, grab a calculator and go for the average, but you're wrong.
If you had read what I posted earlier you see that two of the have 200,000 miles. each, and two are at about 165,000 each.
No additional money spent to make them live.
These are daily driven work trucks. On road / off road use, driven by multiple employees, used to haul loads and trailers, heavy trailers, plow snow, ect daily.
The two newer trucks are/wer emissions compliant motors. They have had issues. The 6.0 had had minor issues. The 6.4 major. All completely emissions related issues.
As Green has stated over and over, they are all junk in their own ways.
Regardless of which brand you choose, all three have had emissions related issues.
I will give more details later on.