Let me know where you plan on doing this, and if it's relatively close-by
to me, I'll be flying in regularly to fill up my Cessna 180 (I'm in
Washington state as well). I used to stop at the Arlington airport
whenever I was anywhere near there to top off with Mogas, but, (as you
probably know), they quit selling Mogas there a short while ago. I've
purchased Mogas at the Pullman airport (stopped there on the way to
KOSH last year for the specific purpose of doing so). Word has it
the Prosser airport also has Mogas for sale, but I haven't personally
purchased any there.
As far as comments/concerns go, some of us out here know what the
wholesale price of 100LL (and Mogas) is around this area (a bunch of my
neighbors have in-ground tanks, and they regularly check the wholesale
prices). I don't mind anybody making a profit, but math is math, and
dollars are dollars. If I can buy Mogas cheaper at the local Chevron
(even paying retail) that's what I'll do (even if I have to continue to shlep
it to my airplane....).
I intend to do my part to make sure the demand side of the 100LL
equation is as low as possible...

(not to mention the fact that that
stuff has way too much lead in it and just fouls plugs & makes exhaust
valves stick in 90% of the GA aircraft fleet currently flying).
Bela P. Havasreti