A shot of Desert Dory's best "at speed" cruise speed.
When conditions allow, I've found this to be the most economical "fast cruise". Slower, around 18 mph, gets me around 4 mpg. This was the case on our Powell trip too.
We almost hit the 100 hour mark (98 hours) on our engine on this trip too. 38 hours on it when we bought it almost a year ago.