Octane Fuel Rating

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Octane Fuel Rating

Post by Hxckid213 on Wed Jul 17, 2013 2:27 pm

Im having a hard time guessing searching what octane rating my 86 cress uses? I check and it shows premium on the fuel site. But my supra used to take 87 octane same engine. Any help? Thanks.

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Re: Octane Fuel Rating

Post by BoxyShazam on Wed Jul 17, 2013 6:26 pm

If it needs premium there will be stickers on your gas lid and sometimes gauge cluster

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Re: Octane Fuel Rating

Post by Hxckid213 on Wed Jul 17, 2013 6:35 pm

Damn! When i got it, it ran nice now ihear a little ping/detonation with 87oct i put on it

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Re: Octane Fuel Rating

Post by Hxckid213 on Wed Jul 17, 2013 6:40 pm

I just checked it says unleaded fuel only.

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Re: Octane Fuel Rating

Post by BoxyShazam on Thu Jul 18, 2013 12:36 pm

Previous owner may have advanced/retarded (I can't remember which) the timing for more power. If so you should run the higher octane.

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Re: Octane Fuel Rating

Post by kamesama980 on Fri Jul 19, 2013 1:53 pm

Designed for premium, will run on regular with light knock. as long as the knock sensor is working, it'll be fine and just return slightly less power and mileage.
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Re: Octane Fuel Rating

Post by 22redlined on Wed Aug 21, 2013 8:23 pm

I have an mx72 and mx73, and once I started running 91 no ethanol, my mileage really increased. Took about a tank to notice, but after that I've been getting an extra 80-100 miles more a tank than on 87 with ethanol. Best I've gotten on the highway so far was around 412miles out of a tank with the sedan. 390 on 93 with ethanol, got me to do some reading.
main reason why I started this was when I went to build my intake I noticed alot of white powder in the intake manifold. Aluminum is the #1 most easily corroded metal with ethanol.

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Re: Octane Fuel Rating

Post by kamesama980 on Wed Aug 28, 2013 12:22 pm

I tore down half a dozen engines for my X8 engine build and none showed any white powder in the intake or head. I know for sure mine's been getting E10 as long as I had it. I even tried E85 when it was like $2 cheaper years ago (big mileage hit but ran OK) and it never showed any signs of corrosion.
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