Fuels.in is a good name to have, there! I'd say that that one would be worth around $750 now, but in a few years I think that it would be worth a lot more, perhaps even around $5,000 - $15,000! What with the current interests in fuel, that name is going to be worth a lot in the near future.
As far as approach.in, I would think that, as stated above, it would be a good domain for a business to have - maybe around $250 - $500 right now?