The less weight, the better the fuel mileage.
usually but not always
Rear bumpers on passenger cars are required by the NTSB.
bumpers headlights
Older cars often had chromium plated bumpers (fenders) more modern cars tend to have either black bumpers or bumpers which are the same colour as the main body of the car (body colour bumpers).
most modern cars have a towing eye. just doesn't look like the ones on race cars. they are usually hidden either in or beneath the bumpers
the bumpers
Less weight equals better fuel mileage. Crampled?
Chromium
To reduce the overall weight of the vehicle and it's centre of gravity. Carbon fibre is also stronger than steel or aluminium.
what do you mean early cars? bumpers and seatbelts and lots of steel.
I think it is legal.
Body color bumpers.