I don't know what's the real problem here. The RPM is too low, all the lights, radio getting dimmer.. sometimes the radio on and off, the voltage seems to be unstable.
After did a few weeks model and price research. Finally I was decided to buy the Dunlop formula D01 as my 4 new tyres, the size is 205/50/16. At first I plan to buy Bridgestone or Toyo tyres, but...