Dozens of drivers raced to a gas station in Wisconsin to buy dirt-cheap fuel after a knucklehead worker accidentally set the price to just pennies per gallon, according to a report.

Cops were called to the BP in Brookfield to investigate the unbelievable price-slash from $2.89 to 28 cents — only to learn a clerk had screwed up the pricing by apparently leaving off the last digit, according to wisn.com.

The pump chump allegedly left the station without noticing his mistake at around 9 p.m. Monday, and word quickly spread about the amazing deal, the outlet reported.

A mob of at least 100 bargain-hunting motorists flocked to the station to fill up their tanks for less than than $5.

In a video posted by the site, one police officer can be heard wondering what’s up with the long line at the station, saying, “Is this like opening weekend or what?”

Another cop reports back, “There’s nothing suspicious going on — it’s literally people waiting for gas” — before discovering the ultra-low price.

The gas station lost $3,500 before managers caught the mistake, police said.

The last time the price of gas was 28 cents per gallon was 1950, according to the US Department of Energy.