I know you'll be unsurprised to hear I'm pro-unlimited gouging, assuming there are enough competitors in the market. If there are many gas stations and one does something particularly egregious, people will shame them (using the Internet!) and remember and punish them after the event. Most gas stations are repeat businesses, so game theory suggests they should behave ethically.

I'd also be fine with quotas, as long as they were set sufficiently high, like enough for a sedan to fill completely. It's the sort of thing that makes people think the government is helping, that things are more fair, without majorly distorting the market and/or leading to scarcity.