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1. Do we consider both private and commercial (large vehicle - trucks) vehicle for assessment? - say the answer is only private vehcile

2. Even with in private vehicle, do we have to consider people driving the car for personal use or people driving for Uber and Lyft. The consumption of gas will vary based on the usage - say the answer is vehicle for personal use only

Make equation:

Money spent per year on Gas = total gas consumption by private vehicle in a year * price of gas per gallon

Total gas consumption by private vehicle per year = number of private vehicles in US * (average gas consumption per month per vehicle * 12)

Number of private vehicle in US = number of households in US * average cars per household

Number of household in US = total US population/ average person per household

Assumptions and Facts:

1.   Gas price = \$3 per gallon

2.  Average person per household = 3

3.  Average car per household = 1.5

4.  Average gas consumption per vehicle per year =  1200 gallon

5. US population = 300 million

Do the Math

Number of household in US = total US population/ average person per household

= 300 million / 3

= 100 million households

Number of private vehicle in US = number of households in US * average cars per household

=  100 million * 1.5 cars per household

= 150 million cars in US

Total gas consumption by private vehicle per year = number of private vehicles in US * (average gas consumption per month per vehicle * 12)

= 150 million cars * (100 gallon per month * 12)

= 150 million * 1200 gallon

=  180 billion gallon

Money spent per year on Gas = total gas consumption by private vehicle in a year * price of gas per gallon

=  180 billion gallon * \$3 per gallon

= \$540 billion

Assuming this calculation is just based on domestic household expenditure and does not include gasoline costs for operting trucks, public transportation, government vehicles, taxis, and ride share services.

• US population = ~300 million
• # of people per household on average = 3
• # of households = 300 million/3 = 100 million
• Assuming 20% of households doesn't own a car and depends solely on public transportation for their needs. That leaves 80 million households that own a car.
• Assuming the households own an average of 2 cars. Hence total cars = 80 million * 2 = 160 million cars
• Assuming each car requires 10 gallons of gas per week at \$3/gallon. Hence expense per year = \$3 * 10 gallons * ~50 weeks = \$1,500/year
• Money spent on gasoline = \$1500 * 160 million cars = \$240 billion