E85 at elevation.

[Swayse]

Is it even worth it to run e85 at 3,300' elevation? My car has 30* total timing with our 91 octane fuel from 3,500 to 7,600 rpm. I've logged e85, and I don't see anymore timing than on 91. Cost per mile is pretty close to the same.

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[Jay-rod427]

I would think even more beneficial at altitude as E85 contains more oxygen which you are short on at altitude. Not just the added spark benefit.

 

[Terminator2]

I would think even more beneficial at altitude as E85 contains more oxygen which you are short on at altitude. Not just the added spark benefit.

Exactly.

 

[Terminator2]

Is it even worth it to run e85 at 3,300' elevation? My car has 30* total timing with our 91 octane fuel from 3,500 to 7,600 rpm. I've logged e85, and I don't see anymore timing than on 91. Cost per mile is pretty close to the same.

Could do up to 32-33* on E-85 at full load at sea level on E-85 vs most will knock at 25-26* on 91. MBT timing at your altitude will be higher so could add 5-6* more most likely at that altitude. Beyond that the extra oxygen from the Ethanol will help with power losses due to less oxygen at your altitude and the extra timing will raise cylinder pressures which helps with barometric pressures losses due to altitude.

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