^^ They could have raised income taxes so that petrol and diesel prices can be kept low. Dont you care for the poor people driving a diesel BMW? People are suffering you know. Oh the humanity!
Yes, need to register in Karnataka. Here are the tax rates
http://rto.kar.nic.in/KMVTA%202010.pdf
http://rto.kar.nic.in/Taxation%20Amendment%20UP%20TO%202008.doc