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So I drive my BRZ at about 5000 feet altitude or higher.
It is nearly impossible to find 93 Octane gas in CO.

I read that at higher altitudes, the higer octanes are not required to eliminate knock because of the reduced air charge.
So I have to run 91 all the time.

Does anyone else have any experience at high altitude with these cars?

Stu
 

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Anyone use 87 during the winter months?

Few other observations, if perhaps you filled up with a lower octane or had bad gas you ecm would just default to the "low-octane" map that basically just adjust timing.

Also 14.7 is too lean run unless its idle or very low load, at wot you are probably at high 11's maybe 12 with the ability of direct injection but nothing close to 14.
 

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Im running an E85 tune by Delicious Tuning... and its AWESOME!! So much power so little work done... all you have to do is tune it and have access to E85 and you got more power! Flex fuel allows you to mix the octanes, i don't have a flex fuel kit yet but will add soon for safety reasons... without the flex fuel kit you have to run out all the regular gasoline before adding the ethanol an tune! Delicious Tuning in CA, Bill Knose will hook it up!
 

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Anyone know if using Octane booster during fill-ups with 91 octane gas be good / bad idea? I can only find 91 octane in Jacksonville Florida and in the manual they stress 93 octane.

Brand recommendations would be great.
 

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Near sea level octane booster should result in a noticable improvement in peak torque around 5,000 rpm. It is a very expensive way to boost octane but the engine is designed for 93 PON.

Most high octane gas around the world is 94. "Regular" gas in Europe is 91.

Where I live at 3,000 ft elevation it makes no difference because the air is too thin anyway.
 

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Thanks again Subieman - I just noticed I do have access to 93 octane gas here so I'm golden, now to find the one my car prefers the most, I'm starting off with Shell and then maybe BP or Exxon next.
 

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Thanks again Subieman - I just noticed I do have access to 93 octane gas here so I'm golden, now to find the one my car prefers the most, I'm starting off with Shell and then maybe BP or Exxon next.
Where I am Shell V Power 91 has no ethanol which is a good thing. I assume their 93 just has more of the same non ethanol octane booster but I am in Canada where ethanol content of gasoline isn't as tightly regulated as in the U.S.

The only 94 I can get is from Petro Canada or ESSO (EXXON 's retail trading name up here). At my elevation it makes no difference because the engine cannot run at peak pressures anyway due to the thin air.
 

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I found 89 ethanol free gas, should I use that with an octane booster or just stick with a 93 octane gas with 10% ethanol? Wow, this gas dilemma is getting to me.
 

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I found 89 ethanol free gas, should I use that with an octane booster or just stick with a 93 octane gas with 10% ethanol? Wow, this gas dilemma is getting to me.
89 isn't enough. There actually isn't any 89 the pump is just set up to draw from both storage tanks at a 50/50 ratio of 87 and 91. So if you fill with 89 you are getting gas from both underground tanks.
 

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I buy ethanol-free when I find it, and notice better gas mileage. I normally get 40 to 42 mpg. With ethanol-free I get up to 44 mpg. What kind of mileage does everyone else get?
 

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How is it possible to get over 40 mpg with these engines? are you coasting down hills and putting up sails when you have a tail wind John?
 

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E85

Im running an E85 tune by Delicious Tuning... and its AWESOME!! So much power so little work done... all you have to do is tune it and have access to E85 and you got more power! Flex fuel allows you to mix the octanes, i don't have a flex fuel kit yet but will add soon for safety reasons... without the flex fuel kit you have to run out all the regular gasoline before adding the ethanol an tune! Delicious Tuning in CA, Bill Knose will hook it up!
Hi,
What mods are required to run E85 and cost?
 
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