[Palmetto Patriot]

17 cents in one day? Either taxes went way up or Exxon and friends will have a banner year

Apparently, prices on the Turnpike had been a bargain over the past week, and prices at gas stations on the Turnpike had merely caught up with local stations.

A Bargain No More: Gas Prices Leap 17 cents on NJ Turnpike, GSP Parkway

They only update prices once a week.

[Alberta's Child]

That's good information there. The service areas on the New Jersey toll roads are operated under a contract that requires them to set prices and keep them for one full week at a time, so they're usually the last ones to "catch up" when prices change either way.

When prices are rising, a lot of drivers will make their way onto the New Jersey Turnpike or Garden State Parkway just to take advantage of the lower prices from the previous week. Conversely, when prices fall quickly there is no reason to buy gas on these roads if you have an alternative.