More Dean 300:
I'd like to see my average speed between Newent and Marlborough* (both similar heights). Imagine if the route had started at Newent - there'd be a lot of out of time riders.
Through the marvels of a GPS tracklog I can give you the answer for me.
12:07 Left Newent control
15:22 arrived Chepstow control
16:01 departed Chepstow control
19:03 arrived Malmesbury control
19:37 departed Malmesbury control
22:14 arrived at Marlborough INFO
23:31 arrived at Membury control
00:08 departed Membury control
01:17 arrived at S-i-t-V INFO
01:20 departed at S-i-t-V INFO
02:48 arrived at Oxford Peartree services control
If the ride had started at Newent:-
At Chepstow (49.7km) I was just within time (3h28 allowed, 3h15 taken).
At Malmesbury (99.1km) I would have been out of time by 6 minutes (6h55 allowed, 7h1 taken)
By Marlborough (135.3km) I was now 40min out of time (9h27 allowed, 10h7 taken)
At Membury (154.4km) down to 37min out of time (10h47 allowed, 11h24 taken)
At S-i-t-V (175.4km) 55 minutes over (12h15 allowed, 13h10 taken)
At the finish: (205.km) I would have clawed it back to just 18 minutes (14h23 allowed, 14h41 taken).
But then I wouldn't have needed to stop for so long at Chepstow, and I wouldn't have had 100km in my legs by then.
Between Newent and Marlborough I did 135.3km in 10h7 mins or 13.37kph but I had stopped for 1h13 mins along the way (39 at Chepstow and 34 minutes at Malmesbury), if I'd kept them to under 40 minutes in total I'd have scraped in.