I have started loving L15A2. The city 2005 now feels rightly powered. Its response is so positive. It gets to 140 like the original would get to 100.
Right now, I have hi-octane in the tank but I hadn't find time to get on the motorway to checking knocking thing. Could not feel anything of the sort within the city, despite driving at 140+. But obviously cannot maintain speed above 130 and have a high divider on my side to check that slight knocking.
Whenever I do, I will report here.
I have the tank filled up. Will report mileage once I refill again.
However, just to compare, on a recent trip to Kalam, we had two cars, this one (city 2005 with L15A2 engine) and a 2014 city. Both of us filled it up on way to Kalam within swat area. I did not fill it up to the brink but the other car was shaken and filled. Both of us drove within few km of each other. When the other city was exiting motorway on way back its reserve light came up, whereas I drove it all way to home near Bahria town, went to work the next day and when leaving office in the evening its reserve light came up!
So we can say the car drove like 80 km more before reserve light came up!