just bought a 2005 scion tc with the TRD supercharger upgarde the book calls for a higher octane fuel there seems to many mixed opinions on if it is really need was wondering if i could get a straight answer?

 

Yes use premium gas

 

premium

 

ONLY run premium.

 

Regular is for base models. Anything turbo/super charged has to be premium to keep from tearing the engine up. Has to do with higher octane fuel not igniting in the chamber prematurely

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really?...that would have been nice to know. ive been using regular since i bought mine. any repercussions to switching premium now?

 

lmao, you have to be kidding.

 

hahahaha, yeeeeaaaah ...yes, im kidding /sarcasm.

there is no knocking or anything.

but seriously...after this tank, i put 93 in it, switching like that with a quarter of a tank of 86? anything bad?

or should i drain the tank and not mix the 86 and 93?

 

The ecu in combination with the knock sensor should tweak the timing/fuel in case there is any ping/knock, but it can only do so much.

Not to mention you break any warranty when you use the wrong fuel in the car >.<

Just don't go all WOT crazy, until you get premium in there, lol.

 

Dont drain the tank - however I would run as much of it out before filling up with premium.

 

Regular premium.