Generally speaking, you'd expect mileage ranging from 10-20 MPG (miles per gallon) in city driving and possibly a bit higher on the highway, but it could be less depending on the factors above. Older models with larger engines would be on the lower end of that range, while some later models might get closer to the higher end.
To find a more precise estimate for a specific El Camino, you'd need to specify the year and engine details.
