After using the car for over 3 weeks since dyno-tuned. The FC hasn't improved but became more thirsty. Gone from 6.5km/L to 5.8-5.9km/L. I've been trying to be a good boy not to floor it but seems that it's not helping much.
When tuning, we didn't realize my vacuum pipe where I tap my boost meter was already leaking. It max boost at 1.22 bar. I got it fixed, FC seems to be higher but I am boosting 1.5 bar now. I guess I need tallman to re-check my tuning. Supposed to get better mileage out of it but I am not. Maybe the leaky vacuum has screwed the mapping.
From power perspective, the car runs very strong and willing. No complaints on that. I am using Petronas Ron 95 now, a very good fuel compared to Shell. But Petronas dries up much faster when it's towards lower than half tank.
Will update more when I have more observation.