ESSO's 91 octane vs. Sunoco's 94 octane ???????
01-19-2007, 06:56 AM
#2
AudiWorld Super User
Join Date: Mar 2000
Posts: 13,967
Likes: 0
Received 0 Likes
on
0 Posts
Talk to Alias Unknown
His mileage went up a lot when he moved away from Sunoco 94 to 91 from somewhere else.
If your car runs fine on 91 and isn't knocking, you probably don't need 94, unless you're using an chip upgrade that calls for 94. Esso, Shell, Petro, it's all the same, other than the additives that are used. I used Petro before and now Shell, no real difference on a non-chipped car. Sunoco 91 has 5% ethanol from what I have read.
Sunoco 94 uses a mixture of ethanol (10%) and gasoline to achieve a higher octane rating and ethanol has lower amount of energy when compared to gasoline. Not sure where the ethanol comes from, might be wood alcohol. Ethanol has about 76000 BTU/gallon while gasoline has 114,000 BTU/gal. So using a 10/90 mixture, Sunoco 94 has about 110200 BTU/gal. It's a difference of 3800 BTU/gal, so technically if you're cruising at a constant state, more fuel will be needed using 94 vs using 91, theoretically.
If your car runs fine on 91 and isn't knocking, you probably don't need 94, unless you're using an chip upgrade that calls for 94. Esso, Shell, Petro, it's all the same, other than the additives that are used. I used Petro before and now Shell, no real difference on a non-chipped car. Sunoco 91 has 5% ethanol from what I have read.
Sunoco 94 uses a mixture of ethanol (10%) and gasoline to achieve a higher octane rating and ethanol has lower amount of energy when compared to gasoline. Not sure where the ethanol comes from, might be wood alcohol. Ethanol has about 76000 BTU/gallon while gasoline has 114,000 BTU/gal. So using a 10/90 mixture, Sunoco 94 has about 110200 BTU/gal. It's a difference of 3800 BTU/gal, so technically if you're cruising at a constant state, more fuel will be needed using 94 vs using 91, theoretically.
01-19-2007, 07:16 AM
#6
AudiWorld Senior Member
Join Date: Mar 2000
Posts: 1,713
Likes: 0
Received 0 Likes
on
0 Posts
Ethanol comes from either corn or....
wheat. One reason to use it is fewer tail pie emissions;
Excerpt from Husky oils website:
"Husky's Mother Nature's Fuel is a clean burning fuel made of 10 percent ethanol and 90 percent gasoline. An alcohol-based product, Husky's ethanol is made from primarily feed wheat. Carbohydrate (starch) in the grain is converted to ethanol in a fermentation and distillation process similar to making beer.
When blended with gasoline, ethanol boosts engine performance and reduces tailpipe emissions. Depending on the vehicle's age, owner's driving habits, driving conditions and other factors, ethanol-blended gasoline can reduce carbon monoxide emissions up to 25 percent. Compared to conventional gasoline, Mother Nature's Fuel can also reduce greenhouse gas emissions associated with production, transportation and use of fuel in vehicles. Currently, Husky markets E85 ethanol-blended gasoline to government fleets across Western Canada."
Hugh<ul><li><a href="http://www.huskyenergy.ca/ourproducts/ethanol/">http://www.huskyenergy.ca/ourproducts/ethanol/</a</li></ul>
Excerpt from Husky oils website:
"Husky's Mother Nature's Fuel is a clean burning fuel made of 10 percent ethanol and 90 percent gasoline. An alcohol-based product, Husky's ethanol is made from primarily feed wheat. Carbohydrate (starch) in the grain is converted to ethanol in a fermentation and distillation process similar to making beer.
When blended with gasoline, ethanol boosts engine performance and reduces tailpipe emissions. Depending on the vehicle's age, owner's driving habits, driving conditions and other factors, ethanol-blended gasoline can reduce carbon monoxide emissions up to 25 percent. Compared to conventional gasoline, Mother Nature's Fuel can also reduce greenhouse gas emissions associated with production, transportation and use of fuel in vehicles. Currently, Husky markets E85 ethanol-blended gasoline to government fleets across Western Canada."
Hugh<ul><li><a href="http://www.huskyenergy.ca/ourproducts/ethanol/">http://www.huskyenergy.ca/ourproducts/ethanol/</a</li></ul>
01-19-2007, 07:22 AM
#7
AudiWorld Senior Member
Join Date: Sep 2006
Location: Toronto, Canada
Posts: 819
Likes: 0
Received 0 Likes
on
0 Posts
Esso is "dirty gas". Less ethanol, but higher energy content = 5-10% better fuel economy.
I can definitely feel a difference between 91 and 93 octane programs, and so I fill the car with Sunoco 94 all of the time, despite the poor fuel economy.
Plus, the 94 pays for my CAA membership.
Plus, the 94 pays for my CAA membership.
Trending Topics
01-19-2007, 07:29 AM
#9
AudiWorld Super User
Join Date: Mar 2000
Posts: 13,967
Likes: 0
Received 0 Likes
on
0 Posts
Good read from Environment Canada...
I'll have to take a read through this.<ul><li><a href="http://www.ec.gc.ca/cleanair-airpur/CAOL/transport/publications/ethgas/ethgas.pdf">http://www.ec.gc.ca/cleanair-airpur/CAOL/transport/publications/ethgas/ethgas.pdf</a</li></ul>