Dwayne: Thats very interesting as we get our fuels from a local parts store or Jessie's and they both just pump from the 55 gallon barrels , never gave a thought about getting stale fuel with race fuel.
Might be a valid reason for re-testing.
The c16 from 110 and c12 was on the 13-1 motor.

i know nothing about weather up there in the summer but, here, its bad , huge water per cubic ft of air just kills us on displacing oxygen.
On the other hand, when it starts getting cold and we get a good, dry, north wind for 14-20 hours, that track at 500 ft above sea level will have Da's at 1100 ft below sea level and i can up the jets a good bit.
Down here, for index racing, you have to run at least a tenth under during cold/dry air in order to run your index from late May through September.

i still say burn rate is very important and running the wrong fuel for the compression/cam is a mistake- at least down here.