Hi Arishi, I recently did Belgaum-Pune trip. Even Highway rates of diesel in karnataka is Re. 1 higher then that of maharashtra city rates. Fill as much diesel as possible in Maharashtra. The road condition in Karnataka side of the small patch which I did is far better then that of Maharashtra. Try to cross MH either in early morning OR after 8 PM. Kolhapur to Pune anytime between 10:00 AM to 8:00 PM is very time consuming even on NH4. The noon time can be little better between 2:00 to 4:00 PM. Do let us know the road conditions post Belgaum. I am also planning to do this road trip but not immdly, somewhere in mid-may.