Theres some debate about weather its ok to run in vehicles that require 91+. Curious if anyone is doing it.

 

Yes, it's fine but mileage is lower

 

Think its better than 87? (for the car)

 

WTF is E10? doesnt all gasoline in the US have 10% ethanol by law?

 

No and I gladly hunt down and pay the extra 10-20% over E10 since gas mileage is no joke 30% better. Not many at all in my state though so it's a treat I only get when down south

 

Hmm, well I threw 15 gallons of 87 (which is already an ethanol blend) and 2 gallons of E-85 into my 2004 ls430, not seeing or hearing anything different. I usually always run 87 and just drive like a grandpa. I put 93 in last tank and she felt a bit better. Wanted to try this mix of 87 and E-85.

 

I tried using ethanol -free 87 octane gas from the local Cenex and did not see much difference in mileage compared to 92 Premium E-10 gas, maybe 1 mpg. Where I live, there is a huge spread of gas prices within 35 miles of where I live. I can purchase 92 Premium Arco E-10 for about 50 cents per gallon less than 87 octane ethanol-free, (a 15 percent premium for no ethanol). Not cost-effective. The engine will run fine on 87 regular, 87 ethanol free, or 92 Premium and I usually pay the extra 30-40 cents per gallon on Premium because that is what Lexus recommends and I want the cats to last as long as possible.

 

You know what consistently feels good in my fuel? MMO. It's super cheap at Walmart and is an excellent cleaning agent. I feel the difference especially in my commuter car. That direct injection gets dirty fast. I use every tank. 1/3 of a bottle per tank of gas. Best bang for the buck product I have found. I run 93 in my SC because I do feel power difference. The plug-in hybrid gets 87. I also us it to help de-carb the engine in the oil about 500 miles before the oil change. Love the stuff. Helps minimize cold start valve clatter.

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No actually. 93 octane is 93 octane regardless of how much ethanol you put in it since that number represents its detonation resistance. E85 is about the same as 105 rated gas and if you bought 105 at a pump and it was an blend not pure gas it still would not change the rating.

You cant advance timing any more than you can vs pure gas on any ethanol blend of the same octane rating. There is also a limit mechanically how far you can advance to take advantage of a E85 blend and most cars can't fully utilize the increased effective octane unless they are forced induction so you will see more than the theoretical chemical loss.

I was using some hyperbole in my statement but real life is 10% or thereabouts and if you use E85 it's over 20% in my own car the one time I tried it and in my toy that runs on it it's way worse than running 105 mileage wise.

You will never see any milage or power improvement under any circumstances running E10 93 rated fuel vs pure gas and since ethanol is hydroscopic it will not last nearly as long sitting and is in general a corrosion risk.

 

And the knock sensors will wear out faster as well.

 

And the debate continues.

on another forum I've seen some responses that say the computer can compensate enough for such a small mixture through stock injectors. My main goal was to get 87 octane up to 91 or so and see how it runs

hell maybe I'm turning e10 into e20, I figured e10 was labeled e10 instead of "93 ethanol blend" (or 91)

 

100% Alcohol contains approximately 33% less BTU's (energy) than 100% gasoline....heat content.

Physics or chemistry...

This suggests 100% alcohol performs 33% less work than 100% gasoline

E-10 is 10% alcohol and 90% gasoline.

So E-10 fuel offers about 3-4 % less range than 100% gasoline.

To placate the Ehanol industry, and farmers,
E-15 is being pushed...so about 5% less mileage there....which creates a greater disparity over EPA mileage ratings

The automakers EPA window certification tags allow mileage ratings using "certification gasoline".

Certification gasoline is 100% gasoline.... which 90% of us cannot practically purchase.

Until auto manufacturers are held accountable for posting accurate mileage figures using E-10, then the misinformation persists..and the automakers have no incentive to take a position on behalf of consumers and what we are stuck putting in our tanks because our illustrious EPA is part and parcel.to the fraud.