In MJD, you can get 30 if you maintain constant 60, which we tried during factory visit drive for a very less distance. . during run in i tried maintaining constant 80 from trivandrum to cochin for around 250 kms and got 24.5kmpl. Once from bangalore to trivandrum, maintained constant 100 throughout like cruise control operated and got 23. once you go above 110, it goes down, maintaining 120 gave around 18-19 and 140 gave 14-15. Petrol sweet spot is above diesels, you can get good figures of 15 even if you cruise at 120 while maintaining a soft footed, non spirited drive.