There are two different prices for cash and cards for gas. Cash price being lower...
This is the way it used to be a long time ago in Australia, but not sure if it still is at all. In Finland, not sure if it has ever been!
In terms of my competitive advantage, I think that's my wife.
That is awesome! I reckon this is the way relationships should work, where we help each other when needed, but most importantly, to be better than we are alone.