octane effects power and engine temp?

[JAAY]

Why would you put 87 in???

[jdlmodelt]

Originally Posted by JAAY

Why would you put 87 in???

Its all the station had that I stopped at. They were the last station in the region that wasn't putting 10% ethanol in the gas. But, I think I would be better with 91 and 10% ethanol?

[jdlmodelt]

Originally Posted by jdlmodelt

Its all the station had that I stopped at. They were the last station in the region that wasn't putting 10% ethanol in the gas. But, I think I would be better with 91 and 10% ethanol?

I didn't notice, it must have happened recently, my wife said there is a new sticker that indicates 10% ethanol plus the inferior 87 octane. double whammy

[jdlmodelt]

my idle is rock solid

[Porsche9]

87 octane??? In a Porsche?? Ferdinand Porsche is rolling over in his grave.

[j.fro]

This is slightly off topic, but may be of interest. Occasionally I have access to non-ethanol 93 octane fuel. I keep track of my mpg and maintenance using an app on my iphone. I find that with the non-ethanol I get about 1-2 mpg better highway mileage, and that it improves another 1-2 mpg in the warmer months. Here's the skinny:
Summer, non-ethanol, 26-28 mpg
Summer, ethanol, 25-27 mpg
Winter, non-ethanol, 24-26 mpg
Winter ethanol, 23-25 mpg
This data was collected since mid May 2013 over 23,000 miles in a 1999 911 C4. I had noticed similar trends earlier in my 2000 986S.

[BYprodriver]

Originally Posted by j.fro

This is slightly off topic, but may be of interest. Occasionally I have access to non-ethanol 93 octane fuel. I keep track of my mpg and maintenance using an app on my iphone. I find that with the non-ethanol I get about 1-2 mpg better highway mileage, and that it improves another 1-2 mpg in the warmer months. Here's the skinny:
Summer, non-ethanol, 26-28 mpg
Summer, ethanol, 25-27 mpg
Winter, non-ethanol, 24-26 mpg
Winter ethanol, 23-25 mpg
This data was collected since mid May 2013 over 23,000 miles in a 1999 911 C4. I had noticed similar trends earlier in my 2000 986S.

I think it's directly on topic. Consumer reports observes a average 15% reduction in MPG with gasohol.

[CoBeerToad]

I keep track of my mpg and maintenance using an app on my iphone..

What's it called?

[BYprodriver]

Originally Posted by jdlmodelt

Its all the station had that I stopped at. They were the last station in the region that wasn't putting 10% ethanol in the gas. But, I think I would be better with 91 and 10% ethanol?

This must be a high elevation location. High altitude reduces octane requirement since the lower oxygen content richens the air/fuel ratio.