Estimation question

Estimate the fuel consumption of cars in USA.

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Structured estimation combining vehicle counts, mileage and fuel efficiency assumptions into a national consumption figure.

Estimate the number of registered cars in the US, roughly 270 to 280 million.
Estimate average annual miles driven per car, around 12,000 to 13,000 miles.
Estimate average fuel efficiency across the fleet, blending older and newer cars, roughly 25 miles per gallon.
Divide total miles driven by fuel efficiency to estimate total gallons consumed annually.
Sanity check the resulting figure against a plausible sense of US gasoline demand scale.

States each assumption clearly, cars, miles per year, and mpg, so the interviewer can follow and adjust the math.
Lands on a number in the range of 100 to 140 billion gallons annually and frames it as an estimate.
Notes that efficiency varies widely between trucks and sedans, and picks a blended average rather than ignoring the mix.

Using an unrealistically high or low mpg assumption without accounting for the mixed vehicle fleet.
Skipping the final sanity check on whether the total feels like a plausible national scale figure.

Chapters of the AI PM course that teach what this question tests.