It can vary greatly. I've paid $6.25 per gallon for diesel in Grand at Rosies (that thief) and $2.30 at Hope Town. Availability can also vary; Rosies is hit and miss and twice got bad fuel there but it's the last stop going northwest. West End, Treasure, Spanish, Hope Town, and Green Turtle are probably the most reliable in the Abaco. Gasoline can be hit and miss in all areas. Call on availability and when the fuel barge makes stops before you leave. Points South are about the same; Bimini, Nassau, Freeport are good but again call to find out the details.