
Fuel economy. According to the U.S. Department of Energy, a vehicle’s fuel economy, in miles per gallon (mpg), decreases rapidly for speeds over 60 mph.
(Sources: U.S. Dept. of Energy; a study by West, B.H., McGill, R.N., Hodgson, J.W., Sluder, S.S., and Smith, D.E., Oak Ridge National Laboratory, 1999; www.mpgforspeed.com, 2014.)
a. Estimate the speed at which the absolute maximum gasoline mileage is obtained.
b. Estimate the speed at which the absolute minimum gasoline mileage is obtained.
c. What is the mileage obtained at 70 mph?

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