I’d actually warn people about overestimating their ability (by a lot) about the Revel big mountain drop races. I’ll admit that I ran the big Mt Charleston marathon a bunch of years back, hoping to run a lifetime best in the marathon with the obvious massive cheater-drop of 5000 feet, and the way-faster ‘average’ marathon time posted on the website (3:57 Revel vs 5:20 LA marathon.) I’ve run the LA marathon twice, so I suspected at the worst, I’d do about the same.
I trained a lot for the race, averaging about 65mpw, which meant a bunch of weeks 70+, and on the Pfitiznger Advanced Marathoning program, which has gotten me to 3:13 on a fair course but on a hot day in San diego, and a 1:25 half marathon in more favorable course conditions.
Despite all that training, my legs got totally trashed after 14 miles on the Mt Charleston course, despite not running faster than my target pace. The downhill was wayyy more extreme than anything I’d ever experienced - it felt great for 5 miles, but by 14 miles, with the unrelenting lack of flat/uphill, if you haven’t practiced this kind of running for 3hrs+ downhill continuously (which is really, really hard to find a course to do it on), you’ll be in a world of hurt. I ran -20minutes slower than expected, even for a non-A result. (-30 minutes compared to my race calculator paces compared to 10k and HM races I ran during the training cycle.) I also specifically did NOT overheat it on the first half - I took it ‘easy’, barely even getting to mid-z2 HR because I knew the leg beatdown was coming, but it was way worse than expected.
I’m almost certain it was the course, and not my training, because after having to run-walk a bunch of miles at miles 19-21 because specific leg muscles were cramping, the race flattens out in the last 2 miles - and the moment I hit the flattish inclines, I dropped 2 miles at 6:50/mile, and was accelerating to the finish since it felt so easy. I was finally able to use the training that I’d developed, which was all blocked by a few errant cramping muscles on that crazy downhill.
I’m certain the crazy fast average times there are because it’s targeted by people who are already marathon-experienced, so the average time is faster say compared to the LA marathon where there are a huge number of rookies aiming to walk most of it. You’d hear on the internet for sure if people were regularly running -15, -20 minutes faster than their PRs there, but it barely comes up.
The races that seem to consistently go super fast are the cool, flattish or even better, SLIGHT donwhill races. CIM seems to be one of the fastest (as is Chicago) - my run and tri buddies who I have beaten at every run race distance have a CIM-specific marathon PR faster than mine, despite me beating them pretty handily at literally every single other race including other marathons, including in tuneup races in the same cycle. I’d love to run CIM in the future, but I’m doubtful, as my ankle arthritis has unfortunately probably taken me out of the marathon game (hence tri.)