For some reason there are gas pumps in New York State that can't go above $3.999 per gallon. (I can understand $9.999, but 3.999? that makes no sense!). Syracuse.com writes that the "New York state Agriculture Commissioner Patrick Hooker today announced that gas stations with non-digital fuel dispensers can apply for half gallon pricing."
Why not solve the problem by using this opportunity to go metric, and sell the gas at about $0.90 cents per litre? You will have three or or four years to change the pumps before you hit $3.999 again. ::Groovy Green