I have the same issue with you. Just got new vios after a few days, while driving the alarm ring for no reason, auto double signal etc. Quickly Go to your nearest Toyota Service center and check.
For my case, i straight go Toyota service center to check, they told me this is first time they encounter this kind of problem.
Got my car repaired at Service center, free of charge.
Ask them to help u wash car too

Yea same to me. Fuel consumption damn bad.
Full tank can go only 440 km.
Actually depends on which petrol you pump, I pump Petron i got better FC.

using Petron97 now, 12.1km/l.
full tank can go 470-480km
Shell quite eat petrol imo.
Bhp and caltex worst.
The best are petron and petronas for me.

full tank 42 litres.
I only can pump 34 litres while almost empty tank.

Hahah, maybe need to ask service centre.
Remember take photo after pumped full tank