Just filled up the tank with 91 octane premium fuel - Toyota Yaris Forums

TheSilkySmooth · 05-08-2009, 12:41 PM

if you have a CAI and open exhaust the ECU might retune over time for the higher octane and you might get some more torque, but I never found the need to add more than 2 gals to the rest of the tank in a mix to get all the octane the engine needs. try mixing in just 2 gals of 93 at a fill up of 87. Our engines are High compression and the eCU can start to retard timing when you get carbon buildup over time. A littel more octane can help. MAy car is starting to ping/knock at starting off in 1st gear at 20K miles on the odo. You dont drive hard enough to clean out this carbon, unless you run the car at WOT 3rd and 4th gear on the highway more than a couple minutes a day. That can clean it out. An melt your 2 layer exhaust pipe too!

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05-08-2009, 12:41 PM	#10
TheSilkySmooth Drives: 08 3DR 5M Bayou Blue; 09 Fos Join Date: Oct 2008 Location: New Hampshire Posts: 622	if you have a CAI and open exhaust the ECU might retune over time for the higher octane and you might get some more torque, but I never found the need to add more than 2 gals to the rest of the tank in a mix to get all the octane the engine needs. try mixing in just 2 gals of 93 at a fill up of 87. Our engines are High compression and the eCU can start to retard timing when you get carbon buildup over time. A littel more octane can help. MAy car is starting to ping/knock at starting off in 1st gear at 20K miles on the odo. You dont drive hard enough to clean out this carbon, unless you run the car at WOT 3rd and 4th gear on the highway more than a couple minutes a day. That can clean it out. An melt your 2 layer exhaust pipe too!