Engineering Economy 16th Edition by William Sullivan ,Elin Wicks, Koelling,

Exercise 2

Refer to Example 11-2. Assuming gasoline costs $4.00 per gallon, find the breakeven mileage per year between the hybrid vehicle and the gas-only vehicle. All other factors remain the same.
EXAMPLE 11-2 Two Alternative Breakeven Analysis: Hybrid Vehicles
Gas-electric (so-called hybrid) vehicles save on gasoline consumption by shutting off the vehicle's engine while idling, giving the vehicle a boost of electric power during acceleration, and capturing electrical energy while braking. In addition to environmental benefits, the primary monetary benefit to the owner is reduced fuel cost as a result of improved gasmileage. The trade-off, however, is that the purchase price of the hybrid vehicle is higher than that of a standard gasoline-only fueled vehicle.
Consider a hybrid vehicle with a sticker price of $31,500. This vehicle will average 30 miles per gallon of gasoline. A tax credit of $1,500 for the hybrid vehicle effectively reduces its sticker price to $30,000. A comparably equipped gasoline-only vehicle will cost $28,000 and will average 25 miles per gallon of gasoline. Assuming an interest rate of 3% per year and a study period of five years, find the breakeven cost of gasoline ($/gal) if the vehicle will be driven 18,000 miles each year.