College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 63

When cruising at 75 mi/h on a highway, a car's engine develops 45 hp. If tills engine has a thermodynamic efficiency of 25% and 1 gal of gasoline has an energy content of 1.3 × 10 8 J, what is the fuel efficiency (in miles per gallon) of this car