Petrol has fallen an average of 42c locally since the Rotorua Daily Post conducted a similar survey at the beginning of October.
Mr Stockdale said petrol prices hadn't dropped below 160c since October 2009.
"One of the reasons Rotorua petrol prices are so cheap is fierce competition between the relatively large number of service stations in Rotorua."
BP communications officer Jonty Mills said there had been 22 consecutive drops in pump prices since early October, largely due to the state of the international oil market.
The previous record for consecutive reductions was 10 in late 2008, although the record for the biggest total drop, set that year, of 50c is yet to be broken.
Mr Stockdale said the four-month-long downward trend showed no signs of stopping.
"There'll be a lot of international experts scratching their heads wondering how low it can go. Hopefully when it does bottom out it stabilises around this level, staying under $2."
He said that if prices stayed this low the average Rotorua motorist could expect to save about $400 over the year, more than enough to cover licensing, registration and a warrant of fitness.
Local motorist Laura Crook felt relief at the price drops, saying she could always use the extra money. "It's good that it's going down, it's been so high for so long."