I do a lot of travel between Vermont and NJ.
In NJ, its easy to find diesel for 1.379 to 1.419, and regular gas is around 1.699. In Vermont, you are hard pressed to find diesel for under 1.609, with regular gas also around 1.699. In upstate NY, Albany-Troy area, diesel is about the same as Vermont.
Needless to say, I try to fill up in NJ.