Educated guesses would have to be in order here but, it makes good sense to look into it though. But, hours run could be a key to premature failures in engines. This may be a good topic for one of our Counterman Magazine stories.
Also, it seems to be true that acceleration is harder on an engine than long, sustained RPMs. So, you may be onto something there.
Gerald Wheelus
Edgewood Auto Parts #253
Edgewood, Texas