Fuel Economy

[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..

Originally Posted by swng

Your mpg numbers are improving every tank Marcus. I will be interested to know how does your car perform after switching back to regular gas as far as fuel economy is concerned. I have tried a tank of 91 Octane fuel (Chevron) and also noticed that the motor sounded a little quieter. That could just be due to psychological or other reasons though. I have just switched to Shell 87 and the car does not seem to have become more noisy.

[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.

[marcus]

ill bring it in tomorrow..

Originally Posted by swng

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.

[uncleyaris]

hey all, on my last tank 38.254 litres to fill drove 626.30 km. I think that calculate to 46.27 mpg, or 6.10 litres per 100km. Not bad!!!!!

[swng]

Originally Posted by uncleyaris

hey all, on my last tank 38.254 litres to fill drove 626.30 km. I think that calculate to 46.27 mpg, or 6.10 litres per 100km. Not bad!!!!!

Good numbers uncle! Lots of highway driving?

[Ah Yum]

Originally Posted by uncleyaris

hey all, on my last tank 38.254 litres to fill drove 626.30 km. I think that calculate to 46.27 mpg, or 6.10 litres per 100km. Not bad!!!!!

That's better than 38 MPG US, overall I'm around there too.