44. The U.S. Department of Energy’s Fuel Economy Guide provides fuel efficiency data for cars and trucks. A portion of the data for 35 standard pickup trucks produced by Chevrolet and General Motors follows (http://www.fueleconomy.gov, March 21, 2003). The column labeled Drive identifies whether the vehicle has two-wheel drive (2WD) or four-wheel drive (4WD). The column labeled Displacement shows the engine’s displacement in liters, the column labeled Cylinders specifies the number of cylinders the engine has, and the column labeled Transmission shows whether the truck has an automatic transmission or a manual transmission. The column labeled City MPG shows the fuel efficiency rating for the truck for city driving in terms of miles per gallon (mpg).