If the monthly drive is 500km max then don't think too much & go ahead with 1.2 Dynamic. If you are a light footed driver then you can get max mileage in city & highway. It will just glide you anywhere without any effort. But if you are a heavy footed driver then the mileage might touch single digit numbers. In mumbai traffic, (Bandra to Vashi) I have got 12.5kmpl with 100% AC with 5 occupants. Same in pune traffic I'm able to get 14kmpl all the time with 50% AC with only me. But on the highways the figures are more than 18kmpl with 4 occupants. Also the mileage figures are lesser in initial days but after crossing 3-4k km mark you can able to make that difference easily.