Vintage 1978 Shell Answer Book #3 The Gasoline Mileage Book The Vintage 1978 Shell Answer Book #3 The Gasoline Mileage Book is a collectible advertising item from the Shell gas and oil company. This yellow book, made in the United States, features information on gasoline mileage and is a nostalgic piece of American automotive history. With the Shell brand, it holds a special place for collectors and enthusiasts of vintage gas and oil memorabilia.