I just discovered the "Great Deals" reports on airnav.com. Here's a
link to the one for 100LL:

http://airnav.com/fuel/greatdeals/long?type=1

I have no affiliation with Airnav. I just found this and thought I'd
share a great way to save a few bucks on your next adventure.

-R
('79 AA-5B)