We were there 6/2 to 6/7 and the gas prices were not the same at each of the Hess stations. The day we left the one closest to Downtown Disney was .02 different (higher) than the one over by the Boardwalk.
Ever since they refurbed these stations from Exxon to Hess, the prices on property have been cheaper than any stations around property. Needless to say, the stations on property have been busier than I have seen them in years.