The previous owner drove it only on cng which partly has destroyed the engine plus he used some weird ass chinese 2000cc injectors and cracked injector cables and a cracked distributor!
Initially it was giving 6 kms/liter but with loads and loads of tweaking we have made it to reach 9km/l
The compression in all cylinders is uneven, cylinder 1 is the most powerful and 4 is the weakest compression wise ps there was a piston slop due to this unbalanced compression...after that we changed the oil to 20w50 and added liqui molli valve cleaner and Benzin plus to the fuel tank, after that the average is 9-10km/l in the city and also the slop and compression have improved!
It's my fathers daily driver so we are planning to get the engine swapped and currently are looking for a 5afe with good compression cause I have seen good 5afes giving 12-13km/l in city
I hope it all made sense to you lol 
