When the price of gas is falling, run your tank empty. Buy at the lowest price.
When the price of gas is rising, top off every time you see a good price.
Because of the stupid Wisconsin minimum markup laws, when the price goes up, it always jumps 12 - 15 cents, then settles back to a market price. Usually, the price jump is on Tuesday or Wednesday, so it makes sense to buy early or late in the week after the price trends back down.
That’s good advice. I may bump my ‘fill-up days’ to Wednesday evenings, instead of Thursday mornings.
However, local gas has been steady at $3.05/gal for the past three weeks. It’s been as high as $3.15, which is still do-able.