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Old 05-17-2015, 06:01 PM   #36
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The method used to calculate the octane rating.

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Old 05-17-2015, 08:10 PM   #37
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Rico3in1 So if I have the GT PP did you suggest just using 87 octane. Long term is the larger octane better for the car?
With the GT it would probably be better to just use the 91 or 93 octane because that engine will perform much better with higher octane.
It will not hurt anything using 87 octane in that engine unless you live in a place with a lot of up hill streets or towing. Then you want to use 91 or 93 octane to avoid any chance of engine knock.

Now with the 3.7 V6--87 octane seems to be fine. I tried 93 and there was "NO" noticeable difference at all in performance, MPG or power. I just went back to the 87 Octane. Mostly whatever B.J.'s sell for gas works fine for my car. It is a 3.7 automatic and always runs great.
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Old 05-18-2015, 05:05 AM   #38
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Originally Posted by SilverS550 View Post
There's a few reasons, but really only one that matters for the car....

Ethanol doesn't completely mix with regular fuel and it does separate out over time. When it does it absorbs water and this isn't good for the motor. This is one of the reasons you want ethanol-free gas if you own a boat. Obviously, water isn't good for engine internals (like injectors, fuel pumps, etc.). Ethanol also isn't good for seals. It's dries and cracks rubbers prematurely.

Neither of these is a huge problem if you go through fuel regularly, so don't go out of your way to find ethanol-free gas. But, if you only use the car occassionally and it sits a lot, you'd be wise to find ethanol-free gas to save yourself some headaches.

The other reason is purely political. The whole ethanol thing is pure BS and is nothing but politics here in the US. Making it from corn requires almost as much fuel to produce it as it you actually yield. Burn one gallon of diesel to get one gallon of ethanol.....sounds brilliant to me. It's a lot more efficient in places like Brazil where they make it from sugar cane. In that process it's MUCH cheaper and environmentally feasible. But, we can leave the politics out of it.
With the oceans Temps rising, there is an increase of red algae with is bad for the entire ocean. I always thought it would be cool to be able to make ethanol from that. You can make it from just about any plant. Idk why we want to choose corn. It would be nice to be able to produce our own sustainable fuel supply be it ethanol, methanol, or whathaveyou.
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