'Your mistake, my gain'... or petty larceny?

MINOCQUA, Wis. - Dozens of drivers made a mad rush for cheap gas after a station employee accidentally changed the price to 33 cents a gallon. [...]

Full story here.  Read it, please, then post your opinion.

Would you rush there and gas up... or try to call the manager?  What are the ethics here?  Discuss.