Ok...fresh calculation time!

Assuming the same riding skill level I will be slower than the fastest rider by at least 8 seconds per lap. Over a 20 lap race I will be behind by 1m30s going into the last lap. Assuming it is just me and the lead rider in a face-off he can park the bike at C8 (leading onto the back straight) and start running from there

Seriously - weren't you around 60 about 18 months back when you were racing regularly? You still had a 15 kilo gap to the lighter riders. Sometimes I think a little bit of weight helps...especially if it is a bit windy.

Nah man, i was at my lightest when racing group D in 2008...was 67kg back then. The weight doesnt help, the heavier you are, the more you cant afford to slow down mid corner.