A 2020 Toyota Camry --- a typical 4-door sedan --- has a curb weight of 3,340 lb and a 15.8 gallon fuel tank (95 lb), for a fuel-to-weight ratio of 2.8%.

Range is ~615 miles at 39 mpg highway.

Passenger and cargo capacity is another 1,500 lb on top of this, give or take.

This is far lower than any conventional aircraft, though a few ultralights might compare.