Trenton: Wow! NJ is set to finally lower a tax. This isn’t a prank! NJ is set to lower one of the highest gas taxes in the nation 8.3 cents per gallon. New Jersey’s current rate is 50.7 cents and it will lower to 42.4 cents on October 1. A huge thank you to the cash cows at Trenton for saving us $1.00 for each fill up.