Have been driving the bezza for a year plus. Got fuel consumption of 12.6km/l. Cuz always in city drive. Kinda dislike the gearbox being quite "lazy". Gear shifts quite slow. The saga seems more powerful than the bezza. Perhaps its an eco setting.

Don't seem to be able to find a way to switch off the ECO setting

Same here. I had a trip to Perodua Sentral and reported on this. They said that its my crank shaft having something loose inside. They couldn't do anything for me on that day because they have too many customers. They asked me to make another appointment for this. I asked if its dangerous or serious. They told me its fine. Nothing major.

By the way, I did soundproofing for my Bezza. Filling the hollow rubber tube lining on all doors really has a huge impact on soundproofing wind noise.

For mine, there is always 1 specific moment. When i release the gas pedal right after accelerating for a short distance. I'm not sure if its the same for you.

I went to a shop and let them do it. I didn't want to DIY cause Im also not sure about it.

I use BHP regularly. But i did use Caltex recently. Problem didn't stop. Thanks for the recommendation though