Sounds kinda strange but...
I buy about four 55-gallon drums of 100LL per year to use in my snowmachines, chainsaws, and if any is left over, dump it into my boat. I have purchased AVgas since 1994 when I began running snogo's. I was always impressed by the nice "hi-test" odor of the fuel (not at all objectionable), and after some research, found this nice odor was due to the percentage of toluene used in the fuel.
I just purchased 60 gallons today, and as the fellow was filling my drums, I was repelled by the physically repulsive odor. It almost made me sick to my stomach; it really stinks.
I telephoned the manager of the tank farm and asked if he was aware of any new formulation of AVgas. I told the fellow I had pruchased a drum early last spring, using it up over the summer, and the stuff I bought today would have come in on the last barge, so something had changed. He replied that he wasn't aware of any changes, and assured me the gas was fresh.
It isn't written in stone that toluene should make up a significant portion of the fuel, only that it has a 100 octane rating, and roughly 2 grams/gallon tetraethyl lead.
Those of you who have fueled up recently, or have been purchasing fuel, can you tell me if your AVgas seems to have changed? You can send me a PM if you like or email rogerr(AT)gci.net.