You'd still see 2.76 a gallon, it would only be the total purcahse that would be affected by the lack of the penny. If you buy 1 gallon of 2.76 gas that turns out to be charged to you at 2.75. If you buy 3 gallons of 2.76 gas that would be 8.28 in which you would pay 8.30.
The law of averaeges would say that in the long run your bottom line would be unaffected by the rounding. Not sure why this has you all ****** off :shrug: