A 2022 Toyota Corolla gets around 40mpg highway and squeezes 5 people inside so it uses 0.5 gallons per person per 100mi.

5 people in the Corolla is 2–3 times as many people as are at all likely to be in there. That's a very skewed number.

When using realistic numbers, cars come in at about the same per mile as large commercial airliners. (Flights tend to be far, far longer of course.)