This is all very useful as when I was out on Sunday there, I didn't qute prepare as well as I could have and ended up bonking badly for about the last 16 miles of my ride (I had to stop at least 3 times to rest and I was so bad that I ended up having to use 'Granny gear' just to get up even the smallest of hills, it was quite deprressing!).
Sports drinks and some oat bar thingimybobbers just about kept me together until I got to Gartocharn where I evetually succumed and got picked up instead.
It wasn't a pretty sight and to make matters worse, I was going into quite a bad headwind and I was sleep deprived (I had stared at 04.30 when the roads were all quiet) ...so yes, it wasn't a pretty sight!!
That said, my bike performed perfectly and helped to cut through the headwind as it's meant too (so it was a bonk at a reasonable speed if that makes sense), but alas, it was the idiot riding it who was the problem, not it.
I wont make that mistake again - prepare prepare PREPARE!!
Incidentally, I still haven't worked out my final mileage, seeing as I couldn't be bothered afterwards, but it is certainly a future ride for me to train on!! (up one side of Loch Lomond and then, via boat, back down the other side from Rowardennan via Drymen, etc).