With the theory that every little bit helps, Bud Eanes, Thomasville, N.C., cuts down on his gas expenses by driving with his tailgate down. This allows the air to flow out of the bed of the truck and cuts down on wind resistance and gas use. Mr. Eanes places a 4 x 4 wood post the width of the truck bed on the floor in front of the wheel wells so he can still use the truck bed and keep in supplies.