What is the best way to give a C# auto-property an initial value?

Question

How do you give a C# auto-property an initial value?

I either use the constructor, or revert to the old syntax.

Using the Constructor:

Answer 1

I know this is an old question, but it came up when I was looking for how to have a default value that gets inherited with the option to override, I came up with

//base class
public class Car
{
    public virtual string FuelUnits
    {
        get { return "gasoline in gallons"; }
        protected set { }
    }
}
//derived
public class Tesla : Car
{
    public override string FuelUnits => "ampere hour";
}