Filling up at a gas station in the US (or buying booze or many other food/drink items at a store I guess) actually are cases where the advertised price actually is the price. (OK, some gas stations have member rewards prices but you still know up front.)
petrol is one of the few things we buy that has tax built in. you pump $23.72, that's exactly what you pay. You prepay with cash - you're having to estimate what, say, $15 will get you. Delta of $2.80/gal vs $3.30/gal - yeah, it's a bit different, but nothing is hidden.
Sales tax on literally everything is fairly different state to state (and within sometimes) but petrol is a major daily thing that is tax inclusive.
