I monitored and tested my single thread speeds for just shy of 2 months as it was very low. I used TBB. My results showed roughly the following for 80/20 at full sync:
multi thread - 74/76 (barring just before changing)
single thread - 74/76 (between 12am and 3ish pm)
single thread - 6/45 (between 3pm and 12pm)
Now in my case if it was the tester then I don't think it would hit 74+ out of peak hours, it should be the same as the poor results. Same PC, same router, same settings, all the same.
BTW this was something my ISP appeared to accept.
One other bit to remember is throughput guarantees; for example TTB only guarantee 15 throughput (on 80/20). This is something no ISP mentions but can use as a fallback. BTW is higher I believe. Again in my opinion to use sync speeds to secure business is misleading.
Edited by Mac99 (Mon 13-Feb-17 09:34:23)