Jim Weir wrote:

-
-1 What is it going to show happened to the EGTs when you switched
-tanks?

The EGT should show a very slight increase. The higher the octane, the smoother
and cooler the burn. You have gone from 100 octane to (arguably) 87 or 93
octane and the car gas should burn hotter.

Are not the auto and aviation octane scales different?