Originally Posted by
EGBKFLYER
Why is that wrong? Avgas is considerably more inflammable than petrol - hence the extra precautions when refuelling. It has a lower flashpoint and autoignition point than car petrol. We were warned of its especially hazardous nature compared with Diesel, petrol and Avtur/ Jet A1 when doing our airfield firefighting course.
Then you were taught by someone who knows nothing about fuels. Your instructor probably thought that the higher the octane, the more volatile the fuel. The opposite is actually true.
AvGas vapourises at a higher temp and has a higher flash point. Diesel and AvTur have even higher octane ratings... and guess what
For the purposes of firefighting, I would treat AvGas as the same as Mogas but its no worse.