Making the Engine Decision - Gasoline and Diesel Engines for GMC Medium Duty Trucks original, sales folder with a Mid-Range Diesel Payback Calculator secured to the back cover. Explains stroke difference between gas and diesel, the operation cost of gas vs. diesel, fuel mileage considerations, cost of maintenance and repair of diesel engine, resale value, making the decision, and more. Clean, good condition. On the bottom edge of the front cover, there is a slight crinkling of the page (see photo). SDH 110