1) Changing petrol every tank. He uses 1 tank BhP, follow by another tank of any other brand. His preference is BhP, but the next tank he will choose some other petrol. He doesn't know why, but if he uses BhP continuously, he can only achive between 13-14km/l. I took a wild guess, to confuse the ECU, do not let it adapt to similar firing sequence/ignition timing. 1 tank 14km/l, another tank 16km/l. Everytime RM38/20litre. Sometimes 320km lite up, sometimes 280 lite up.

2) Never fill up full tank. He doesn't know why, he guessed if full tank the car carry more weight, result in bad FC. I was query on the reliability since its not full tank, but he denied saying consistently doing between 280-320km. If not reliable, there will be often seeing 1 time fuel up drop below 280km, coz petrol being over utilized by previous tank. So, I think the arguement is legit.

3) At red lights, N gear. When turn green, engage D, release brake, let the car roll before step on gas pedal. Maintain gentle pedal work, let 4AT gradually upshift around 2krpm.

4) Empty boot. Clean air filter. Minimal electrical usage besides of aircon+radio. Clean interior as well. He said sand & dust also got weight. He only weighted 45kg

So, I guess its about time to lose weight. I hope this benefit some 4AT poor soul. The pesoga is standard M line 2010 model. Gradually travel between cheras - jalan ipoh - selayang. Mixture of IRR and city traffic. Just these few tips I got from him

Ofcourse he also mentioned some other stuff like never wait inside the car with idling engine + aircon, which we already know. So I didn't touch those bits, just wanted to share some of his idea that I've never thought about.
Not crying out loud, but I've got so used to 15cents/km. Suddenly a GaGa make me pay almost close to 20cents/km really butt hurt. I'm putting a lot of hope to improve on fuel efficiency, even got into a fight with some senior member(unoehu i tok about) regarding FC issues.