The closest to me is 7 miles and not particularly convenient. And one must belong to Costco.
I’m careless about the gas I buy. For the last 13 years I’ve driven only occasionally. I haven’t bought any since February; I didn’t buy any in 2016. I’m pretty sure they’re all harmless. I hope it will dissolve the varnish I should expect and pick up the water. If they do nothing, have been a waste of $1 annually for the last 20 years - c’est la vie.