there is plenty of anecdotal chat about how much time epo knocks off a good-responding top guy
i think this woud give a prelim estimate of what epo coud do for aforementioned top responder
( the 1/2M/M times are for a track & shoud be 1 - 2 minutes slower on the road, but you didn't specify the surface !
anyhows, the numbers can be scaled up or down )
starting off, i'd offer a non-epo elite
54.00 / 1'52.90 ->
3'40.1 , 7'38.5 , 13'06.6 , 27'14.5 , 59'48 , 2"03'54
now, i doubt "usual" doper dose of epo will improve the 400 by more than 0.25s
doubling this advantage for 800 woud mean 0.5s improvement, but epo works better for increasing distance, so the advantage is going to be more, i reckon from anecdotal gossip over the years, probably about 0.7 - 0.8s
therefore for above guy
53.75 / 1'52.20 ->
3'38.4 , 7'34.4 , 12'59.0 , 26'56.6 , 59'05 , 2"02'17
or
53.75 / 1'52.15 ->
3'38.2 , 7'33.9 , 12'57.8 , 26'53.7 , 58'57 , 2"01'59
or
53.75 / 1'52.10 ->
3'38.1 , 7'33.3 , 12'56.7 , 26'50.8 , 58'49 , 2"01'41
i'd suggest, for "standard" epo dosing on a good responder, the advantage is
800 - ~ 0.8s
1500 - ~ 2s
3000 - ~ 5s
5000 - ~ 10s
10000 - ~ 25s
1/2M - ~ 1'00
M - ~ 2'15
i'd be surprised if even with much higher doses of epo on a good responding elite that you woud get much more than these, as you are already pretty much taxing the bone marrow to a physiological maximum