Guys, the following are the latest updates:
The fuel Mileage was my big concern. I took the car back to Jamil Autos for the compression test to see if the engine was built properly.
I also asked Mr Irshad to also arrange used O2 Sensor, MAF Sensor, Fuel Injectors so we try and see what works and what doesnt..
Comression Test.
The compression test on all 4 was between 170 and 180 which is pretty good so we moved to on the next item O2 Sensor.
As soon we saw the condition of the O2 sensor, we felt that this is a problem, we changed the sensor, cleared the codes and went for the test drive. I drove from Jamil Autos to Bahria Town, the following is the result.
Currently my city average is between 11-12 with AC on and between 14.5-16 on the highway. I am pretty happy.
The great thing with Irshad Bhai is that he arranged several used parts to try and the part which we didnt work, we were able to return it.
My experience is that the engine rebuild specialist will just rebuild the engine, they will not look at anything else. You have to research on your own, make a list of items that could be worng and force your mechanic to excel.