June 16-25 2017 I rode a 48 in 10. I left Flagstaff on the 23rd with extreme heat warnings forecast. The night before I put as many water bottles in my hotel room freezer as possible and the rest of a flat in the fridge. I read all I could find on riding in the heat , and was very glad I did. I keep a soft sided cooler on the pillion seat to keep drinks handy. I started early drinking a bottle of water every half hour as a minimum. As I got closer to Needles the temperature started to climb it was 116F at 10:30, shoulda left earlier maybe. It got up a bit over 120 by Las Vegas around lunch time, definitely should have left earlier. Before Needless I put a couple of frozen water bottles inside my lined jacket and soaked my Dri wear T-shirt. My Goldwing has a center windshield vent that when open blows on my chest. Keeping my shirt wet, controlling my airflow and zipper, and drinking a lot of water and Gatorade kept me surprisingly comfortable. I ate at Subway, Cold cut subs, if you ask nicely they will cut and wrap separately in 3, I ate a third every gas stop. I rode a bit over 1000 miles that day, and felt great. I never suffered any ill effects from the heat, good thing as I was a long ways from home still. I did email my forms and receipts in this September 13 but they are pretty busy so certificate is still pending.