what brand of gas do you use
#31
#32
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It's marketing that makes us think gas brands are different. Since they're all coming out of the exact same refineries (of which there are fewer and fewer), buy your gas where they sell a lot of it. That way you know you're getting relatively "fresh" stuff.
If you want to pay more for Shell, Chevron, or whatever...big oil loves you.
If you want to pay more for Shell, Chevron, or whatever...big oil loves you.
#33
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My Porsche and Mercedes only gets Shell and Conoco, 91 octane, b/c of the high altitude, we don't need or have 93 octane. The Conoco near my house is only a few pennies from the cheapest. I guess I'm a sucker for their marking ploy. I feel weird putting cheap gas in an expensive car. We don't have BP, Exxon, Chevron here (or least not anywhere near). My minivan and suv gets safeway or the cheapest gas.
#35
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When in MA, I use Shell 93 or Mobil if there's not Shell around.
In CA, I use Shell 91 (highest available).
I can't understand why they limit octane to 91 in CA. Maybe it's supposed to be cleaner (less pollution) but on a CA to MA trip, I found my miles per gallon increased noticeably when the available gas octane was 93. So you have to use more gas with 91 octane so I wonder if it wouldn't be cleaner to run higher octane and use less gas. Just my 2 cents or 2 octanes.
In CA, I use Shell 91 (highest available).
I can't understand why they limit octane to 91 in CA. Maybe it's supposed to be cleaner (less pollution) but on a CA to MA trip, I found my miles per gallon increased noticeably when the available gas octane was 93. So you have to use more gas with 91 octane so I wonder if it wouldn't be cleaner to run higher octane and use less gas. Just my 2 cents or 2 octanes.
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#36
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Take a look at this recent post, and pay special attention to Jean's comments:
https://rennlist.com/forums/993-turb...uals-ok-2.html
#37
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The high altitude robs your power. The 91 octane vs the 93 is another power drop. So, I'm not following your logic or agree with your statement.
Take a look at this recent post, and pay special attention to Jean's comments:
https://rennlist.com/forums/993-turb...uals-ok-2.html
Take a look at this recent post, and pay special attention to Jean's comments:
https://rennlist.com/forums/993-turb...uals-ok-2.html
#39
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The high altitude robs your power. The 91 octane vs the 93 is another power drop. So, I'm not following your logic or agree with your statement.
Take a look at this recent post, and pay special attention to Jean's comments:
https://rennlist.com/forums/993-turb...uals-ok-2.html
Take a look at this recent post, and pay special attention to Jean's comments:
https://rennlist.com/forums/993-turb...uals-ok-2.html
"United States: in the US octane rating is displayed in AKI. In the Rocky Mountain (high elevation) states, 85 AKI (90 RON) is the minimum octane, and 91 AKI (95 RON) is the maximum octane available in fuel[citation needed]. The reason for this is that in higher-elevation areas, a typical naturally-aspirated engine draws in less air mass per cycle because of the reduced density of the atmosphere. This directly translates to less fuel and reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill a carbureted car that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine."
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We still have Shell in Southern Idaho, but it's now usually polluted with ethanol. On the positive side it's 93 octane. Recently the local Chevron's have gone to 93 octane NON-ethanol. Quite interesting as we are over 4000 feet altitude and until a few months ago only 91 octane was available.
#43
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93 here is directly equivalent to 99 in the UK. It is essentially the same octane rating, measured on two different scales - the UK uses RON, the US uses AKI.
#44
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I prefer whatever my wife pays for to fill the tank.
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#45
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