im driving around 120kmh average, same like you... 60% highway 40% city area..

I get around 430km once the petrol bar reach the last one...

Using Petronas!

And i heard ppl said a new car once pumped that petrol, must always stick with that petrol for better performance??

When just got my car, no petrol, nearest is Petronas, so no choice, I pumped Petronas and from that on, I keep using Petronas.

Last time used to pump Shell, and can say is Shell fan. Haha.. Easier to find. And Petronas the credit card machine always got problem, usually OFFLINE.

A friend of mine told me, his friend using Vios tried many petrols, at last found out Caltex is the best among all in term of petrol.

Any experience?

You can do sound proofing for your car, by putting sound proof materials in between your car door, engine hood , ceiling and underneath your car, you can reduce wind noise, road noise ,engine noise and also tyre noise from the outside. 

question... i supposed to bring my vios to service for 10k..and now exceeded about 800km...r they going to void my warranty?

so, that means after the 5k service, if i service my car at other workshop, my 3yrs warranty will void right?
but toyota service centre price is not cheap leh~ how ar~?