I realize this is off topic as well, but perhaps of higher interest.
It pertains to testing of 94UL in a Continental.

http://www.flyingmag.com/piloting/1865/flying-a-big-bore-engine-without-the-lead.html

One comment in the article near the end I would question is this one:

/"Of course, because 94UL is lower in octane than 100LL, its potential
energy will be lower across the board, regardless of whose engine the
future fuel is being used to power."/

High Octane provides a slower burn rate, but caloric value should be the
same regardless of Octane number.
What is the general consensus on that?

Rolf