"The Model T had a front-mounted 177-cubic-inch (2.9 L) inline four-cylinder engine, producing 20 hp (15 kW), for a top speed of 40–45 mph (64–72 km/h)."
Being faster than horses isn't why cars won. Given the choice between a modern car and a hypothetical horse with the same or higher top speed, most people are still not going to choose the horse.
"The Model T had a front-mounted 177-cubic-inch (2.9 L) inline four-cylinder engine, producing 20 hp (15 kW), for a top speed of 40–45 mph (64–72 km/h)."
Being faster than horses isn't why cars won. Given the choice between a modern car and a hypothetical horse with the same or higher top speed, most people are still not going to choose the horse.