The San Luis Obispo Tour de Donut is an amazing race. Definitely the most difficult of all the Tour de Donuts. This 2 stage race is really unique. In Stage 1, the whole pack of cyclists ride 15 miles together, making 3 stops to eat donuts for time credits. The time credit given per donut eaten is only 15 seconds (vs 3 or 5 min for other Tour de Donuts). Then Stage 2 is a time trial up Perfumo Canyon Road. It's a very steep (6% avg grade) 3 mile climb.
I won the "Donut King" title for most donuts consumed (22) and Jake Pickett won the Overall title by making it to the top of the road first. He's a beast! This race will test you to the limits and the folks who put it on are really into it. Check out slotourdedonut.com for more info!