I have been running 91-octane gas for several years with no adverse effects I can see, except for possibly running hotter (my manual says 95 octane). It is the best gas I can find around here. Does anyone run aviation gas - 100 octane, low lead. If so; 1) does it help with engine temps? 2) Any power advantages? 3) Any negative effects? 91 octanes is about $1.69 here and the AV gas is about $2.78. Is it worth it?