John, Would be easy to say it do no more and no less area if using same surfacer and not figuring in rinsing or complications. OR that it do twice the area if all were equal in way of expected results and but surfacer is larger. There is no way to figure a way around the rinsing or the compications though. Look at David's results.. he is at 2k to 2.5k only even with the big machines. Rinsing and moving hosing, etc. takes toll that just can't be figured accurately.
Best way I can figure to gain speed with larger setup would be an attempt to tweak both the rinsing and surfacing acts by increasing surfacer size and then configuring a half moon type shroud to it that forces the escaping water and debri to blow one direction only towards where you will be cleaning in an attempt to auto rinse or at least lesson the rinse process.
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All things being equal, how much more concrete will an 8gpm machine clean as compared to the same surface being cleaned by a 4gpm machine?
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None..if the surfacer is tuned and spinning sufficiently the same with the 4 compared to the 8. Reason being that the surfacer swath is the same and the operator will still be moving at a speed that is comfortable or normal. That speed so happens to be slow enough that a 4 or 5 gpm machine can keep up. In theory you could run faster with the 8 if the surfacer is underrated for what it's units could be pushing. Btw, my hydrotek bar/swivel does not get me same bar spin as my diy bar that was utilizing a deublin swivel.