Jaya and I drove from Jamshedpur to Kolkata (about 300 km) earlier this month and returned after spending a week there. It was a pleasant surprise to find the Jharkhand roads (NH 33) in a much better condition now. The 100 km stretch between Jamshedpur and Bahragora is quite okay now barring a few very short bad stretches. But the 20 km distance between Bahragora and Chichira (Jharkhand / West Bengal border) still has some pretty horrible stretches. The border checkpost itself is highly chaotic (as usual) with nobody to control the flow of traffic and is frequently jammed. The road surface at the border is literally 'rock bottom' with gigantic craters.
After Chichira the roads in West Bengal are quite good and the stretch of NH6 between Kharagpur and Kolkata (part of the Golden Quadrilateral) is excellent. For the first time (I have been regularly driving on this highway since 2000) I did 140 kmph on this stretch and 110-120 for long distances. It was fun.
I got a mileage of 24 kmpl on the highway and around 16 kmpl in Kolkata with about 90% AC.