Stu Gotts wrote:
1 What is it going to show happened to the EGTs when you switched
tanks?

I was taught that 87 and 100LL avgas burns at the same temperature. The
octane only allows the flame front to propagate smoothly through the
cylinder. Autogas is a different formulation, so it may burn at a
different temperature.
If autogas burns cooler, the EGTs will decrease. If autogas burns
hotter, the EGTs will increase.

2 What is it going to show happened to the CHTS when you switched
tanks?

CHTs will follow EGTs.


3 (not in the JPI, but: ) What is the airspeed going to do? Increase?
Decrease? Stay the same?
Why?

Depends on the energy content of the fuel, not the temperature. Pistons
work on pressure. The more energy released by the fuel, the more
pressure is generated to drive the piston. More energy means the engine
is turning faster (higher torque?). More torque transmitted to the prop
produces more airspeed.

That's my reasoning.