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Just had a look and the last few longer rides (60-80 miles) I did were all around 0.85 IF (so 85% of FTP, I'm assuming) and they were all 'pushing on' but not killing myself. For me that seems to be a comfortable intensity that wouldn't drop over 100 miles, but I'll see later in the week! Yesterday I did 63 miles with a lot of pretty quick climbing then rode back into an enormous headwind and it was 0.84 IF. I may be wrong, but I suspect NP for solo rides are lower because there are fewer massive spikes (e.g. village sign sprints) that you get on group rides; I didn't really go over 600w yesterday.
On a slightly related note, and apologies if I'm preaching to the choir, but if you're looking for good on-the-bike food that isn't gels then Aldi bars are excellent. They do really cheap fruit bars which are just fruit mashed together (£1.50 for 6, I think) and also 'Hike' bars (50p each), which are mashed date with protein added and are AMAZING, especially the cacao ones.
Trying to get back into doing longer rides again after spending most of the winter doing intervals on the rollers. Kind of inspired by Mike Hall also.
Previously, have not got my pacing and eating and drinking right. For 100mile+ rides, what kind of %FTP does your NP end up being ? How often do you eat on the bike ?