The Chevy Aveo gets on average 25 to 27 miles per gallon in the city, and 34 to 35 miles per gallon on the highway. The exact number of miles per gallon depends on numerous factors.
The way a person drives has an impact on fuel economy. Driving fast and breaking hard lowers the number of miles per gallon. Towing heavy loads burns more gas. Idling, or sitting with the car running without moving, also lowers the fuel efficiency of a car. Even weather impacts the number of miles per gallon a car gets. Colder weather means more gas is used to warm the engine.