I sure have seen LA in those conditions and totally agree with you, slim I was just being a bit flippant earlier. Your gas stations have the right idea.
I do worry about the amount of pollutants I'm pumping into the atmosphere when flying. I'd be the first to use somthing cleaner like one of the new Jet A burning pistons, if:
a) I could afford my own aircraft, and
b) could afford to modify it.
For now, looks like we don't have much choice.
I would consider pouring the fuel samples back into the tank, although doing this (x 3) and leaving the filler caps off during the walkround could surely lead (eventually) to someone forgetting to put one back on afterwards. Will 20 or 30 cc of fuel on the ground really make a difference when you're about to burn 10 gal/hour?