Shop owners and trolls often report inaccurate gas prices. It seems innocent until you find a 20 minute old report that weirdly underreports the price of gas by 20 cents, and find them at a number of nearby stations while you try to figure out if you've spent more gas driving to different ststions than you could save by finding at least one correct one.
There should be a mechanism to either moderate this, or simply add a mechanism of photo verification at the pump with a confirm/deny for the next person who gets there.