The ad promotes a new brand of car. What benefit of the internal combustion engine does the ad emphasize?

It emphasizes affordability

Explanation:

This is the excerpt:

For the young business man the ford runabout is a profitable partner and a happy companion for the boy who is making his mark in business and at school. it reduces distance from a matter of miles to a matter of minutes. by saving time and effort, it makes larger earnings possible. and costing little to buy and keep going, it quickly pays for itself. when vacation time rolls round the runabout enables the young business man to reduce by hours the time between work and play. let us tell you how easy it is to buy a ford on the weekly purchase plan. ford motor company, detroit, michigan the ad promotes a new brand of car.

It talks about how fast the car is due to the new engine type in use and also talks about how cheap and flexible the purchasing plans.

This emphasizes the affordability of the internal combustion type.