It's true that E85 has less energy per oz than gasoline. However, its unique properties (knock resistance, cooling effect) mean you can tune the engine to produce more power. In particular, boosted motors do exceptionally well with E85.

I won't bother getting a citation because there are probably hundreds of cars just on this forum producing more power on E85 than 93. You can look for yourself.

Edit: literally 5 seconds of googling:

http://www.speedhunters.com/2015/04/...about-ethanol/

I said I am willing to be convinced...

So why not do some googling yourself?

http://koenigsegg.com/ccxr/

Edit: this really has been discussed ad nauseam. E85 means you can run more boost, advance the timing, and produce more power without detonation. It also means roughly 33% increased fuel consumption. Generally, the price difference between E85 and 93 is offset by the increased consumption, so fuel cost is about the same overall.

On my 02 wrx when I had it I was running 20psi on 93 and able to muster 265whp 240tq. I tuned it on e85 and went up to 24psi and the power jumped up to a even 320whp 320tq.

It was my understanding that he was talking about a stock engine.

Thanks man, that's very valuable info!

Saw your car at pizzahut yesterday:)

I saw before there is a post by Shiv showing the E85 dyno result on stock engine. If I remembered correct it will be more than 10HP gain on E85 than 93. I don't remember which post it is but you could try search on forum.

I remember a while back as well that Delicious Tuning was able to get 200 or 201 WHP on a completely stock BRZ with an E85 tune. Granted this was a custom tune and probably quite aggressive but the ability to make power is pretty significant. I also didn't see their stock run to know if it was a relatively high or low dyno but if you figure that these cars seem to make anywhere from 156 to 176 whp stock on pump gas on dynos best case is almost a 33% power increase over stock for just switching fuel.

I remembered it was 190ish on the E85 dyno chart and it is an old post. So I said more than 10HP because I don't really remember it. Anyway, it is free power that don't hurt anything, definitely worth a try.

You've never seen a car run on e85 have you, look at dyno plots of the same car, same day, same dyno and observe the difference in hp/tq rating from both runs and you can come to your own conclusion (I can't spoon feed the information to you though as then you wouldn't learn as research is a very important part in retaining information... also im lazy)

I have delicious on my brz. I have not dyno'd it to see exact gains 93 vs e85 and i do have aftermarket catback and a drop in panel filter but even so I can feel a difference in the way the car accelerates on e85 vs 93. Comes on a bit sooner and pulls just a bit harder for a bit longer then stock.

there's a reason why the most common bang for buck power mod is header+tune and e85 and why countless people are running their NA with headers and e85 and making great figures vs stock.

you said you didn't see any benefits I have provided one, more power, others have provided the burns cooler also. That's 2 reasons you know of now. Whether they offset the negatives (production, etc.) is up to you but that wasn't what you asked.

He was definitely not talking about stock, if you can't read or absolutely disbelieve e85 you can't help in this thread, I even posted tune edits for him. What fumanchu said is correct