I would suggest that if your engine rattles on regular octane fuel then it has a problem that your selling dealer should have repaired (warranty). higher octane fuel is less likely to detonate prematurely. Quote Originally Posted by jambo101 Thats backwards the higher octane burns cooler than lower octane thus the carbon builds up ultimately choking your engine and oil with carbon and sludge build up.You might want to check your timing for that rattling you are hearing as the car should run smooth and quiet on regular octane gas. I continued to put in regular 87 octane gas and the car kept rattling and it was very I bought my hatch in August 2007 and from the day I drove it home on the first dealer-bought tank of gas noticed what sounded like a valvetrain rattle or something like that. I know octane and gas questions have been covered elsewhere on the forum but in all of those threads there isnt a clear answer on the subject. its very EXPENSIVE to remove & replace the fuel pump as its (agin) in the fuel tank ie the running a tank all most out regularry heats up the fuel pump each time which will cause the pump to fail long before its time. Quote Originally Posted by black2 yaris you should NOT let yer tank get to a blinking bar as the fuel PUMP is in the GAS tank & uses fuel to keep it COOL.
its very EXPENSIVE to remove & replace the fuel pump as its (agin) in the fuel tank ie the tank must be drained & then removed You should NOT let yer tank get to a blinking bar as the fuel PUMP is in the GAS tank & uses fuel to keep it COOL. Not that im going to push it and get to the points where i How much gas do i have left when i am at one bar and its blinking Does that mean when that bar goes away im out Or does it go to no bars and then give a warning I have just been filling it right when it gets to the blinking bar but i have been curious how far i can really go with that blinking bar. So I have been wondering this for a while. I could be wrong though about premium gas containing more fuel additives but if they are more Reduction in power and economy less MPG which negates any money you saved. Most people should once the engine detects a knock it will retard the timing which will reduce economy and power. I dont know about that article Using regular-grade fuel in a vehicle designed for premium Can you do it Absolutely. Its a common misconception a lot of people do use premium once and awhile for I do however get WORSE gas mileage when I use premium. Quote Originally Posted by Kaotic Lazagna I use the highest octane (premium 91 here regular is 87) once a month or two since it has a higher concentrate of detergent of the gas brand that I use (Chevron) for cleaning purposes. Details When in Neutral it vibrates very little but as i press softly the accelerator it loses its vibration. Though this vibration has gone down gradually after i first started using 95. Scenario I have noticed the vibration of my yaris has increased just recently when i mistakenly fueled it up with petrol 95 (super premium 95) i was using petrol 91 since i purchased it.