The GDB Mesquite Time Trial... It's a 7.5 mile loop with its start/finish inside the Mesquite (International) Airport. We ride from Poteet High School out to the site, do the TT, then get back before sunset.
As shown in the pic, the first couple miles are somewhat downhill, then there are a couple miles of rollers followed by a tough climb, then ANOTHER couple miles of steady uphill grade. To complicate things, there's usually (as there was last night) a good south / southeast wind blowing, that makes the final couple miles a real grind...
The first time I attempted it was in February of this year, and I was pleasantly surprised to do a 20:29 time, averaging 22.25 mph. Most riders are in the 20-22 minute timeframe, with a few approaching the 18's and 19's on occasion... In March I tried it again, and broke 20 minutes with a 19:52 (22.95 mph). Then I missed the next three months due to medical and other reasons, as I watched others improve their times.
I finally got back out there last night, and despite a good 10+ mph southeast wind, popped a 19:35 time (23.13 mph) -- which was actually good enough to win the night by a ten second margin!!!
Must be all that recent hill climbing and trike riding....