In Mumbai, from the domestic airport how to reach charanjit rai marg,fort?

It is around 25Km from Domestic Airport to Fort. Pre-paid taxis are available inside and also outside the airport. Even though you take a pre-paid taxi the driver again takes 50 or 100 Rs if you don't argue with him. Totally it will be around 500Rs in the morning. If you are arriving in night then the prices will be bit higher than this. I'm not sure about auto's availabilty in Airport. But I don't think Autos are allowed in Fort and Colaba area..... so better to take taxi.