Hybrid cars are touted as a “green” alternative; however, the financial aspects of hybrid ownership are not as clear. Consider a 2015 Lexus RX 450h, which had a list price of $5,765 (including tax consequences) more than a Lexus RX 350. Additionally, the annual ownership costs (other than fuel) for the hybrid were expected to be $320 more than the traditional sedan. The mileage estimate was 5.2 litre/100 km for the hybrid and 6.9 for the traditional sedan. |
a). To make the hybrid worthwhile, the total cost (including list price + annual ownership cost + gasoline cost) has to equal or be lower than the total cost for the traditional sedan.
Let the kilometres driven/year be x. Then, total gasoline cost will be x*mileage*number of years*gasoline cost
Hybrid sedan gasoline cost = x*5.2*6*1.55 = 0.4836x
Traditional sedan gasoline cost = x*6.9*1.55 = 0.6417x
Extra list price for the hybrid sedan = 5,765
Extra ownership cost for the hybrid sedan for 6 years = extra annual ownership cost*number of years = 320*6 = 1,920
Total cost for hybrid sedan = Total cost for traditional sedan
0.4836x + 5,765 + 1,920 = 0.6417x
0.1581x = 7,685
x = 7,685/0.1581 = 48,608.48 or 48,609 kms
b). Again, we need to equate the costs of the two sedans.
Let the gasoline cost be y ($/lt)
Total gasoline cost will be distance per year*number of years*mileage*gasoline cost/100
Then, for hybrid sedan, gasoline cost will be (15,200*6*5.2*y)/100 = 4,742.40y
Traditional sedan, gasoline cost will be (15,200*6*6.9*y)/100 = 6,292.80y
4,742.40y + 5,765 + 1,920 = 6,292.80y
1,550.4y = 7,685
y = 7,685/1,550.4 = 4.96
Gasoline cost needs to be at least $4.96/lt
c-1). In this case, time value of money will be considered. So, annual cash flows will be discounted back to the present time and the NPVs of both sedans will be calculated. The distance per year at which difference in NPVs is zero will be the minimum driving distance which will justify buying a hybrid sedan.
Use excel Solver for this: Condition to be checked is NPV of hybrid sedan - NPV of traditional sedan = 0. Variable to be changed will be distance per year.
Formula | Hybrid | Traditional | |
Lexus RX450h | Lexus RX 350 | ||
D | Distance/year (km) | 65,358.49 | 65,358.49 |
M | Mileage (lt/100 km) | 5.20 | 6.90 |
N | Number of years | 6.00 | 6.00 |
C | Gasoline cost ($/lt) | 1.55 | 1.55 |
AOC | Extra annual ownership cost ($) | 320.00 | - |
LP | Extra List price ($) | 5,765.00 | - |
r | Interest rate | 12% | 12% |
GC = (D*M*C)/100 | Gasoline cost per year | 5,267.89 | 6,990.09 |
TC = GC + AOC | Total cost per year | 5,587.89 | 6,990.09 |
PV = TC*(1 - (1+r)^-N)/r | PV of total cost per year | 22,974.11 | 28,739.11 |
NPV = PV + LP | NPV | 28,739.11 | 28,739.11 |
Difference | - |
Distance per year which makes buying a hybrid worthwhile = 65,358
c-2). Again use Solver for this. Changing variable will now be the gasoline cost per lt.
Formula | Hybrid | Traditional | |
Lexus RX450h | Lexus RX 350 | ||
D | Distance/year (km) | 15,200.00 | 15,200.00 |
M | Mileage (lt/100 km) | 5.20 | 6.90 |
N | Number of years | 6.00 | 6.00 |
C | Gasoline cost ($/lt) | 6.66 | 6.66 |
AOC | Extra annual ownership cost ($) | 320.00 | - |
LP | Extra List price ($) | 5,765.00 | - |
r | Interest rate | 12% | 12% |
GC = (D*M*C)/100 | Gasoline cost per year | 5,267.89 | 6,990.09 |
TC = GC + AOC | Total cost per year | 5,587.89 | 6,990.09 |
PV = TC*(1 - (1+r)^-N)/r | PV of total cost per year | 22,974.11 | 28,739.11 |
NPV = PV + LP | NPV | 28,739.11 | 28,739.11 |
Difference | 0.00 |
Gasoline cost has to be $6.66/lt to justify buying a hybrid sedan.
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