Is 80,000 miles on a used 2012 F-250 Diesel too much?

Ive got about 73,000 miles on my '11 and it still looks and drives like brand new. Ive done 4 oil changes, 1 fuel filter change, 1 air filter change and on my second set of tires. It is used for some fairly heavy work. I noticed the turbo wasn't behaving quite right the day after I picked it up so that was replaced under warranty but other than that it has been pretty much flawless.