I like Detroits. I been running and rebuilding since 1960. One issue with TIBs and other turbo engines is exhaust gas temperatures. Running at full power really cuts the time between overhauls. The high temperatures created eat away at the cylinder components. A usual rebuild is about 3000 hours. If you back off, say 25 knots instead of 30, you can usually double the hours. Natural Detroits can run flat out forever because they don't get that hot. When I was young, I ran 671s and 12v71s turbo engines in a fleet with other operators running the same boats and same engines. By running at about 80% of hp, I doubled the hours between rebuilds, about 6-7000. One set of twins made 11,000 before overhaul. Clean oil is another part of the issue. As an operator, I use to get bonuses for the longer hours between overhauls and not beating the crap out of my motors.