Even considering the fact that it is stated in the posted price- it is still an attempt to psychologically trick people into believing the gasoline is a little cheaper than it really is. That makes it a scam.
It was always a dishonest practice, now it is a pointless one as well. Back when gas cost 35 cents per gallon, that extra 9/10 of a cent was a significant percentage of the price. Over 2.25%, in fact. That made it even worse.
Is your integrity so unimportant to you, as a gas station owner, that you still feel the need to skim that extra 9/10 of a cent when the gasoline costs $3.40 or more per gallon? That scammed 9/10 of a penny is now only about a quarter of a percent of the price, and will continue to be less significant as the price rises.
Yes, I realize that if a person buys 15 gallons, you get the same profit off that 9/10 of a cent whether the price per gallon is 35 cents, or $5.45. Round the price up to the next whole penny, and you can add another 1/10 of a cent to the total honestly.
I would like to see a gas station (or franchise) owner step up and publicly reject the traditional price scamming game. Just round it up to the honest whole-cent price, and publicize that you did it. I'll bet you'd get more business just as a reward for rejecting the scam. At the least, you'd be trading a dishonest psychological trick for an honest one.