Octane Poll

[bigskyRaptor]

91 ethanol free for me. 93 is not available where i am

 

[Raptorbert]

With premium (93) in awful Illinois being 4.60-5 dollars a gallon ive stuck with 87 for my daily commutes.

 

[DaveInMn]

Truly asking because I’m not very knowledgeable on this. Why are the HP numbers higher with a E85 tune? Also, I’m pretty sure I’ve seen @GooseTuned mention it’s safe to add a couple (?) gallons of E85 to a regular tank for some added performance (without needing to tune for it).

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Per my reading/experience, ethanol handles detonation better than gas (can run a higher compression ratio or more advanced timing = more HPs). The price for this is ehanol has ~1/3 less energy/volune than gas, so the MPGs will be correspondingly less. Plus as stated in the reference, ethanol has other negatives.
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[DougDimmadome]

Update: I can’t tell a difference with 93 vs 87

 

[DaveInMn]

Update: I can’t tell a difference with 93 vs 87

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"6"..... lol
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[Donmatteo]

I never understand some of the logic reg: price between 87 and 91.
It's at MOST, regardless of market conditions, .30 cents between 87 and 91. That's $10.80 assuming you are empty and it's a .30 cent delta.
Here in CA it's .15 cents at the Shell by my house with makes it an additional $5.40 more for a complete fill up.

It's a twin turbo performance motor. If you want to cut costs, don't spend $90K on a truck.

 

[Donmatteo]

Update: I can’t tell a difference with 93 vs 87

Just because you can't tell the difference doesn't mean it isnt making a difference.
ECU, Engine, Fuel system etc will notice. Also, there is some calibration time when changing between fuels.

 

[Raptorbert]

I never understand some of the logic reg: price between 87 and 91.
It's at MOST, regardless of market conditions, .30 cents between 87 and 91. That's $10.80 assuming you are empty and it's a .30 cent delta.
Here in CA it's .15 cents at the Shell by my house with makes it an additional $5.40 more for a complete fill up.

It's a twin turbo performance motor. If you want to cut costs, don't spend $90K on a truck.

It’s a performance motor that I putt around in as a daily driver. If I go somewhere to have fun with it, I’ll add in that premium fuel for the extra zoom zooms. It’s made to work with 87 so it’s not like a trx that REQUIRES premium fuel. The difference in 87 vs 93 today in my neck of the woods Illinois is 78 cents cheapest option vs cheapest option.

 

[77Raptor]

I never understand some of the logic reg: price between 87 and 91.
It's at MOST, regardless of market conditions, .30 cents between 87 and 91. That's $10.80 assuming you are empty and it's a .30 cent delta.
Here in CA it's .15 cents at the Shell by my house with makes it an additional $5.40 more for a complete fill up.

It's a twin turbo performance motor. If you want to cut costs, don't spend $90K on a truck.

It clearly must depend on where you're located. Around here (south of Charlotte, NC, right on the NC/SC border) 87 is currently $3.39 at the two stations I usually go to (Shell and QT). 93 (no 91 around here) is currently $3.89 at both, so 50 cents more per gallon. The non-ethanol 87 is the same price as the premium. So it can potentially be an almost $20 increase in the cost of a tank of gas. Some areas are more than that, as seen in the reply above this one. So I can see why some people might not want to pay that extra cost, especially if the truck is a daily driver for them.

 

[DougDimmadome]

I never understand some of the logic reg: price between 87 and 91.
It's at MOST, regardless of market conditions, .30 cents between 87 and 91. That's $10.80 assuming you are empty and it's a .30 cent delta.
Here in CA it's .15 cents at the Shell by my house with makes it an additional $5.40 more for a complete fill up.

It's a twin turbo performance motor. If you want to cut costs, don't spend $90K on a truck.

93 is around 75 cents more in my area.