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Ask clarifying questions:
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
= 180 billion gallon * $3 per gallon
= $540 billion
Can I assume that we are focusing not on other petroleum products such as diesel etc. ? - Yes.
- no usage - Millenials do not prefer cars and wish to live in cities and use either public transport or uber. poor people might not be able to afford cars and rely on public transport only. so, let us skip this segment
- low usage - assuming of 20% of 100M households have one small sedan car and fill their tank only once per month.
- 10 gallons / month -> 100 gallons / year (rounding it )
- medium - assuming 50% of 100M household have 2 cars and collectively drive up to 20K miles per year. assuming 20mpg per gallon, (20,000/20 mpg) = 1000 gallons per year
- 20K / 40 = 1000 gallons / year
- high usage - 20% of 100M household have 2+ cars and on average drive 20K miles per year. let us assume that average mpg is also 20 mpg. (1000 gallons)
- 20K / 20mpg = 1000 gallons / year
- 1000 gallons * 3000
- 3M gallons
- 5000 gallons * 2000
- 10M gallon
companies = medium + large = 3M + 10M = 13M * 4 = 52M
total = individuals + companies. = 300B + 10M
= 300B (rounding up)
summary: US spend approximately 300B in gas per year.
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