I had no idea this sub existed until today...
I've been doing keto for 9 years now, and I started after my third marathon. Since then I have done a few dozen halves, 32 fulls, 2 ultras, and who knows how many 5k and 10ks along with all the training that's associated. I also lift heavy at least three times a week.
Anytime I talk about running a marathon in ketosis on the training subreddits, I always get shouted down like I'm crazy, but I started doing keto because I couldn't keep enough food down to fuel during my runs because I am such a big guy with associated caloric needs. Anyhow, I now go out and run my marathons on just having heavy cream coffee a couple of hours before and nothing during except for significant electrolytes.
Anyhow, just happy that I found this sub, and also maybe learn some tips or tricks that I haven't had to learn through trial and error as well as see what other's experiences have been like.