you might get 5000iph on a gto in good condition with one setup and the same job for 8 hours on good paper under perfect conditions. while I am not the worlds best pressman, i could never keep a gto runing over 6000 iph registering well, feeding well and printing well at the same time. if I had 80# gloss cover I could but then you are loading and loading twice as often. 50 and 60# offset under good conditions maybe 6000 but never 7000iph. even with a preloading. your still stopping for atleast 60 seconds to get the paper in the feeder and the paper out of the delivery. and nobody does it that fast every time. so you are looking at loosing 2 to 3 minutes 2 times an hour. heaven forbid if you get a hickey there is 5 minutes.
anyway we always figured 3000iph on long runs of 15,000 or less. 4500iph on 50m runs. 2000iph on short run. 500 letter head, 1000 3part ncr. of course this is all average impressions per hour not run speed.
on a gto the runs are generally not 50,000 too often. those get bumped up to a 4 up machine.
we used to run the gto at 4500 iph unless there was a difficult stock. then you slow it down. and it never gets cranked back up right away. not untill the next decent job.