You only get bad gas at cheap independent stations.
Sea foam is about $28 a gallon
Once again...
Nope...
I can get bad gas from rapid fluctuations in temperatures due to condensation...
I can get bad gas from stations that just received a truck load from the agitation of tank filling...
I can get bad gas from ethanol blended fuels when "phasing" happens...
I can get bad gas when 87 octane is dispersed through all three grade offerings...
I can get bad gas from a gas can when the dog sprayed in the fill spout while I was checking the oil level on the lawn mower...
You can get bad gas from siphoning fuel from unknown vehicles...
What I can't do is buy from a reputable station when on the road due to the unfamiliarity. Busy pumps are a better choice...
The good news...
There are very few teflon coated walls in the world.