Will these work at any shell?
works pretty much at any shell in NY/NJ/CT/MA/DC/MD (did work at 1 station in NJ where price drops to zero as the system's min price is $0.019 per gallon) but not outside these regions your change is half and half. For an example, I had it work in Chicago, North Carolina, Florida, Hawaii,Missouri,South Carolina,Texas, California (northern) but doesn't work in Southern CA, Seattle.
the 35 limit is also hit and miss. some pumps give you 35 some at 20.