Fuel Consumption of Domestic Cars Thanks to smaller and more fuel efficient models, American carmakers doubled their average fuel economy over a 13-year period, from 1974 to 1987. The following figure gives the average fuel consumption in miles per gallon (mpg) of domestic-built cars over the period under consideration (t = 0 corresponds to the beginning of 1974). Use the Trapezoidal Rule to estimate the average fuel consumption of the domestic cars built during this period. (Round your answer to two decimal places.) 26.6 26.6 26.67 26.4 mpg 25.6 25.0 24.6 24.2 22.6 19.3 18.7 17.2 16.6 14.8 13.2 mpg 74 75 76 77 78 79 80 81 82 83 84 85 86 87 mpg