I had bought a highline deisel in march 2013 and I have had ample of long drives and in city usage. The car is wonderful in terms of long drives. It has given me a maximum avg of 30km/l once(Pune-lonavla).
I have driven this car at 180+kmph on the mumbai pune expressway and the car was still driving extremely stable. There are no issues in terms of maintenance and the servicing is done just once per year. Even the service centres are extremely nice ppl.