Apart from the team entry fee costs can vary a lot. It depends if you want to travel as vagabonds or pampered princesses.
Finding a place to sleep is probably going to cost £150 - £200 each for the whole trip and food is about £100 each on top of that. It's easy to spend 4 times as much if you need to sleep on Egyptian cotton or can't bear to use a squat toilet but if you're happy eating rice and dahl and sleeping in rat infested hovels you can finish the run having spent a pittance.
Fuel will tally up to about £250 per Rickshaw. Other costs include your insurance, visas and flights. Then add a little extra money for chai and fresh underwear and you are set to go. We've got a more detailed breakdown of the money stuff here on our website.