octane effects power and engine temp?

[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.

[JFP in PA]

Originally Posted by BYprodriver

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

Brought to you by your Federal Nannies, along with less fuel stability, faster and higher levels of water contamination, and endless corrosion of expensive fuel system components......your tax dollars in action.

[BYprodriver]

Money truly is the root of most evil!

[Slate 01]

Originally Posted by JFP in PA

Brought to you by your Federal Nannies, along with less fuel stability, faster and higher levels of water contamination, and endless corrosion of expensive fuel system components......your tax dollars in action.

I knew there was a reason I liked JFP. Fuggin Nannystate no doubt imposing stupid demands on it's people and over a hoax just adds insult to injury

[CoBeerToad]

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

What's it called?

[j.fro]

The app is called Road Trip:
https://itunes.apple.com/us/app/road-trip-mpg-mileage-fuel/id298398207?mt=8

I think it's one of the best apps I've purchased.

[jdlmodelt]

I added octane booster to this tank till I get all the non 91 octane out. I also changed the oil. I discovered that my oil cap does not seal when it is tightened down. How come these engines have a vacuum at the oil fill tube instead of pressure?

[JFP in PA]

Originally Posted by jdlmodelt

I added octane booster to this tank till I get all the non 91 octane out. I also changed the oil. I discovered that my oil cap does not seal when it is tightened down. How come these engines have a vacuum at the oil fill tube instead of pressure?

The AOS also lowers the pressure in the sump to a vacuum around -5 inches of water so that the low tension piston rings can properly seal.................