I've been driving more than usual lately, and using more fuel, so I've been taking more than a passing interest in prices.
In particular, while the servos advertise their cheapest price in huge letters, they kind of "forget" to advertise the expensive 95 or 98 octane stuff we actually had to buy.
So, this is a survey of advertised vs actual prices for the fuel we need....feel free to add in this format:
Brand, Location, cheapest price on sign (usually e10 91 octane), 95: margin 98: margin
Interesting to learn that different brands, and even different locations on the same brand charge different margins.