Which Gas?
10-07-2011, 01:16 PM
#101
But here in United Arab Emirates we have 98 (locally called super) and 95 (called special) octane only. I always use 98 and the few times that the petrol pump ran out of 98 I used 95 and noticed reduced performance as well as a rougher engine sound.
My engine runs smoother on 98.
What should I do?
My engine runs smoother on 98.
What should I do?
10-07-2011, 01:21 PM
#102
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But here in United Arab Emirates we have 98 (locally called super) and 95 (called special) octane only. I always use 98 and the few times that the petrol pump ran out of 98 I used 95 and noticed reduced performance as well as a rougher engine sound.
My engine runs smoother on 98.
What should I do?
My engine runs smoother on 98.
What should I do?
Here in the US, if you use our high octane race fuels (100+) in a stock LS1, there would be zero benefit, and I would expect a reduction in gas mileage and WOT performance.
10-07-2011, 01:26 PM
#103
mmm I thought this octane measurement is universally the same everywhere...
I would say I get a slightly increased mileage using 98 instead of 95. But engine definitely runs smoother on 98.
I would say I get a slightly increased mileage using 98 instead of 95. But engine definitely runs smoother on 98.
12-25-2011, 08:42 PM
#104
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Hi!
I´m from Spain and I love american cars… I hate ******* turbo small engines, nothing more beautiful than a massive engine, high cubic inches, and high torque at low rpm… Not talk about a vehicle that the owner can repair in his garage, not a ******* bmw, mercedes, or audis that you must pay hundreds or thousands dollars for repairs, simple services or stupid parts…
Here we use a different octane index for gas. I always have doubts about what gas is better for my v8, because here we only have 95 octane gas and 98. Most people think that USA gas has low octanes and thinks 95 gas is sufficient for their american cars… We normally accept that 98 Euro gas is the best for engines with compression of 10:1 or more.
I have been using 95 octanes with my americans v8´s with no problems and nothing rare in engine performance… But I have been looking for a technical answer, I hope it will help foreign people, it is here:
RON (Research Octane Number):
UK, Europe, South Africa & Australia
MON (Motor Octane Number):
Motor sport applications. Measured under more severe conditions than RON (higher revs etc). Usually 8-10 units lower than the RON.
PON (Pump Octane Number):
- Average of RON & MON. Usually 4-5 units lower than the RON. USA, Canada.
PON=(RON+MON)/2
So, approximately:
91 octane USA gas = 95 octane European Gas
93 octane USA gas = 98 octane European Gas
In the cheapest place of Spain, and probably Europe:
95 octane= 0.962 €/liter (1.256 $)
98 octane= 1,069 €/liter (1.395 $)
I know my LS1 is 10:1, and my 95 gas is like 91 in USA… but I will try with 98… I will tell you if I get more MPG or performance…
I´m from Spain and I love american cars… I hate ******* turbo small engines, nothing more beautiful than a massive engine, high cubic inches, and high torque at low rpm… Not talk about a vehicle that the owner can repair in his garage, not a ******* bmw, mercedes, or audis that you must pay hundreds or thousands dollars for repairs, simple services or stupid parts…
Here we use a different octane index for gas. I always have doubts about what gas is better for my v8, because here we only have 95 octane gas and 98. Most people think that USA gas has low octanes and thinks 95 gas is sufficient for their american cars… We normally accept that 98 Euro gas is the best for engines with compression of 10:1 or more.
I have been using 95 octanes with my americans v8´s with no problems and nothing rare in engine performance… But I have been looking for a technical answer, I hope it will help foreign people, it is here:
RON (Research Octane Number):
UK, Europe, South Africa & Australia
MON (Motor Octane Number):
Motor sport applications. Measured under more severe conditions than RON (higher revs etc). Usually 8-10 units lower than the RON.
PON (Pump Octane Number):
- Average of RON & MON. Usually 4-5 units lower than the RON. USA, Canada.
PON=(RON+MON)/2
So, approximately:
91 octane USA gas = 95 octane European Gas
93 octane USA gas = 98 octane European Gas
In the cheapest place of Spain, and probably Europe:
95 octane= 0.962 €/liter (1.256 $)
98 octane= 1,069 €/liter (1.395 $)
I know my LS1 is 10:1, and my 95 gas is like 91 in USA… but I will try with 98… I will tell you if I get more MPG or performance…
12-25-2011, 08:59 PM
#105
RON (Research Octane Number):
UK, Europe, South Africa & Australia
MON (Motor Octane Number):
Motor sport applications. Measured under more severe conditions than RON (higher revs etc). Usually 8-10 units lower than the RON.
PON (Pump Octane Number):
- Average of RON & MON. Usually 4-5 units lower than the RON. USA, Canada.
PON=(RON+MON)/2
So, approximately:
91 octane USA gas = 95 octane European Gas
93 octane USA gas = 98 octane European Gas
In the cheapest place of Spain, and probably Europe:
95 octane= 0.962 €/liter (1.256 $)
98 octane= 1,069 €/liter (1.395 $)
I know my LS1 is 10:1, and my 95 gas is like 91 in USA… but I will try with 98… I will tell you if I get more MPG or performance…
UK, Europe, South Africa & Australia
MON (Motor Octane Number):
Motor sport applications. Measured under more severe conditions than RON (higher revs etc). Usually 8-10 units lower than the RON.
PON (Pump Octane Number):
- Average of RON & MON. Usually 4-5 units lower than the RON. USA, Canada.
PON=(RON+MON)/2
So, approximately:
91 octane USA gas = 95 octane European Gas
93 octane USA gas = 98 octane European Gas
In the cheapest place of Spain, and probably Europe:
95 octane= 0.962 €/liter (1.256 $)
98 octane= 1,069 €/liter (1.395 $)
I know my LS1 is 10:1, and my 95 gas is like 91 in USA… but I will try with 98… I will tell you if I get more MPG or performance…
Is it bad that the voice in my head read that with a spanish accent?
12-25-2011, 09:21 PM
#106
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If the above is correct (91 USA octane = 95 Euro octane, and 93 USA octane = 98 Euro octane), then you will see little to no difference in performance or MPG between the two octanes on a stock LS1 with a stock tune.
On the other hand, once you start getting to 100 octane (USA rating) or more on a stock engine/stock tune LS1, you will probably notice a slight loss of MPG and throttle response/performance.
12-25-2011, 10:49 PM
#107
Go with what is recommended for the car, it makes the most sense. My V6 Camaro called for 87. If I put anything higher in it - even just bumping to 89 - it would drop mpg every time (though it didn't feel much different). Also found that it ran best and got the best mpg on the BP gas vs Speedway or Marathon. 32 mpg out of that car on the interstate at 70mph.
My Trailblazer doesn't seem to care what I put in it or what brand. It gets the same mpg on average no matter what goes in the tank
If I had a Z28 I'd put premium in. The cost difference is minimal over all and it is recommended for the engine, so that's what I'd stick in it. And given how some lose mpg going to lower octane anyway, there is very little reason to even mess with lower octane fuel in the first place as it gains nothing to do so.
12-27-2011, 01:29 PM
#108
TECH Fanatic
Go with what is recommended for the car, it makes the most sense. My V6 Camaro called for 87. If I put anything higher in it - even just bumping to 89 - it would drop mpg every time (though it didn't feel much different). Also found that it ran best and got the best mpg on the BP gas vs Speedway or Marathon. 32 mpg out of that car on the interstate at 70mph.
. Who knows how much longer it'll be ethanol free 5 years ago most 91 didn't have ethanol BP premium was actual 92 octane and there was even one place that still had 93.
12-27-2011, 04:04 PM
#109
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Excuse my english, I know it could be better... xD
Here is the website where I got the info: http://www.torquecars.com/articles/f...ne-ratings.php
I filled the tank with 98 euro premium gas (98 BP ULTIMATE)... After that, due to a recommendation of a mexican friend (T/A ls1 owner), I disconnected the battery for 20 minutes, to delete "fast learn numbers", and to achieve the advantages of more octanes sooner... Disconnecting the battery the car will learn how to use the new gas with more octanes in about 15 miles.
I feel more hp and I can say that the car runs and shifting smoother and better without knocks... The car burn the tires more agressive shifting to second gear at full throttle...
So please, drivers in countries with RON octane index, use 98 gas instead of 95 with LS1 engine.
My car is stock, only SLP LID and K&N air filter.
Here is the website where I got the info: http://www.torquecars.com/articles/f...ne-ratings.php
I filled the tank with 98 euro premium gas (98 BP ULTIMATE)... After that, due to a recommendation of a mexican friend (T/A ls1 owner), I disconnected the battery for 20 minutes, to delete "fast learn numbers", and to achieve the advantages of more octanes sooner... Disconnecting the battery the car will learn how to use the new gas with more octanes in about 15 miles.
I feel more hp and I can say that the car runs and shifting smoother and better without knocks... The car burn the tires more agressive shifting to second gear at full throttle...
So please, drivers in countries with RON octane index, use 98 gas instead of 95 with LS1 engine.
My car is stock, only SLP LID and K&N air filter.
Last edited by JJ-WS6; 12-27-2011 at 04:31 PM.
12-27-2011, 07:44 PM
#110
I know hear in Iowa 87 octane doesn't have ethanol in it and 89 octane has 10% ethanol. That's the likely reason your mpg dropped with 89, I get almost 3mpg better mileage out of my 96 Grand Prix with 87 over 89 even know know 89 is $.10 cheaper I'm money ahead with 87. I also get 2-3 better mpg out of my T/A with 91 octane from BP because almost all of the other stations put 10% ethanol in there 91. Who knows how much longer it'll be ethanol free 5 years ago most 91 didn't have ethanol BP premium was actual 92 octane and there was even one place that still had 93.
. Who knows how much longer it'll be ethanol free 5 years ago most 91 didn't have ethanol BP premium was actual 92 octane and there was even one place that still had 93.
12-31-2011, 02:28 PM
#112
TECH Fanatic
I wouldn't be mad if I were you the places around here that used to sell 92 or 93 and now sell 91 didn't lower there prices any.
01-03-2012, 04:23 AM
#114
People look too far into this. Bottom line is run 91 or 93 in the states depending what you have and be done with it and stick with a decent brand ie 76, Shell, Chevron, Sunoco, Texaco. I had to run 87 for a day because thets all AAA would give me and i noticed a huge dropoff in mileage.
07-24-2012, 01:26 PM
#116
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