Fuel Economy

[swng]

Originally Posted by marcus

try opening your window and driving right beside a wall and accelerate..the wall will revert the noise back to you...on regular youll hear a kinna like knockin on the engine noise only during acceleration if you dont then ur car is fine.. still trying to find out if its due to the timing chain..but it does go away on 89 octane gas.. so mostlikely its either timing too advance or the antiknock sensor not working properly..

Tried that but not much difference heard. Will listen more carefully when the surrounding is quiet. Meanwhile, may be you would like to consider eTiMaGo's suggestion (Post #1214) i.e. ask Toyota to check it out for you to see if there is a problem. I am no expert but I think the car's computer (aka ECU) should be able to adjust ignition timing to suit different fuel octane numbers. Our Yari are designed to run on regular fuel anyway. Still grateful that you have brought this subject up for discussion and wish you best of luck!
You know, when all are equal, we may as well hang on to regular fuel for economy.