Gas worms or worm gas

My gadgets on the left side of the screen show gas in zip codes 98366 Port Orchard, Washington and 98528 Belfair, Washington. The two cities are about 15 Miles apart yet gas is 10 cents cheeper in Port Orchard. If I drove there from my home in Belfair to save 10 cents a gal. on a fill up or about 3 bucks wouldn't I burn 30 miles of gas getting there and back. Well if the rig I drive is doing well on mileage I figure I would save about a buck total. On a nice day I might opt for a pretty drive but on a cold wet rainey day I think I will be cursing - "The Worms!"