Karnataka polls: Is BJP more efficient in translating votes into seats?

Opinion polls in Karnataka are looking fuzzy as of now, and like Gujarat, only the day of the result will tell us which way the pendulum swings. Campaigns, money, charisma, emotive issues and polarisation are undoubtedly the factors at work, but what does election data say about the electoral support competing parties in Karnataka have?

In the 2013 assembly election, former BJP chief minister B S Yeddyurappa split from the parent party to form Karnataka Janata Party. 

In 2013, the BJP won 40 seats (or 18% of the seats) with 20% of popular vote. The fallout faction KJP won six