Any downside to lowering cruise RPM?

[sst5167]

It's easy to get caught up in the mph game. But what gain do you actually see from 2 mph on the race track versus an opponent? I have found that a lower t/s rpm raises many more variables. Drastic weather conditions would change the rpm more. But the biggest issue is wind. At a lower rpm, you are "coasting" through the wind, and not "driving" through it.
But that's just my free opinion. You can take it for what its worth!