running 15% ethanol and 91 octane

[rlhdweman]

If you really want to see a difference at the track, add a nitrous injection system...
Powertrain warranty OTOH is risky.

I've had 4 different vehicles that I tried NOS on, lots of fun & only blew apart 2 carburetors! no engines or transmissions.

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[notfast]

the ecoboost really noticed the difference

In what ways? Are you running an E85 tune?

 

[rlhdweman]

In what ways? Are you running an E85 tune?

No tune yet, I believe the stock ECU can handle more timing than needed for 91. Throttle response is definitely snappier, as I said I only add a couple gallons which keeps me under 15% ethanol content.

 

[Longhorn]

I’m just wondering if you would get the same performance out of E 15 gas as premium. Because it’s like a dollar cheaper by me.

for me e85 is 3.49 premium is 5.99 so using premium and e15 together saves me around 5$ at the pump

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