This is the 772nd most frequent Russian word.
авто
The Russian word "авто" means "car" or "automobile" in English.
Here 'авто' is used as a short form for 'автомобиль', meaning 'car'.
Я купил новое авто.
I bought a new car.
In this sentence, 'авто' still serves as a synonym for 'автомобиль', emphasizing its qualities.
Этот авто очень быстро разгоняется.
This car accelerates very quickly.
This usage of 'авто' maintains the general reference to a car, now emphasizing an incident involving it.