Just the once for me
I'd only been cycling a few months and, stupidly, I entered an audax that was 60 miles with 7,500ft of climbing. No real idea about fuelling, think I had some cake at about half way
Last 15 miles I just totally ran out of gas. I remember having to stop on the Brickworks climb which is about 8% max. Ended up crawling up modest inclines in 34/32
Made it to the pub, ham sandwich and a coke. I had planned to ride the 6 miles home but called for a pick-up. When it arrived I was still so befuddled I couldn't work out how to get the bike into the back of the car. My wife had to do it for me