I bought Hyundai i10 bluedrive LPG car on Dec’ 06 2011. Till now did 5000 km... 60% highways and 40% city. Mileage is 12 kmpl in heavy traffic conditions, and 14 kmpl on average traffic conditions. On highways it is 16 Kmpl with AC and 18 kmpl without AC. The figures given is on LPG fuel. Petrol mileage I didn’t check. In regard to the maintenance.
I may be able to update once I cross 15000/- km.