There's some good advice here already.

Like has been said already

Run all your fuels with the same prop - measure your max rpms, and take your temperature at the same place under the same conditions with each fuel test.

Buy all means run the Coleman fuel right along with your other tests. You will find that it runs well. You also have the temperature gun to spot any over heating right away.

Readjust the needle valves as necessary for each fuel type.

Then you may try taking advantage of the higher octane ratings, first by timing change and then maybe by increasing the compression.

You will soon find out that the engine will for a second or two run at a faster rpm and then drop by 100 or 200 rpm and then stay steady. Take notes of these drops.