Last week when we were there, we paid $2.11 inside WDW at the car care center - outside, near I Drive, gas was around $2.40 to get the tourists =) In other parts of Orlando, it was much lower.
Just returned today from Disney World and the cheapest gas we found was at the intersection of 192 and 417. It was a Racetrack station and was $2.05. Closer to where we stayed off of 192 the gas was outrageously high.