87,89 or 91 Octane?
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Freshman User
Joined: Feb 2006
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87,89 or 91 Octane?
Hi,
I have a new 05 Expedition and work pays for my gas. Will it help or hurt if I run higher Octane gas? Also, I was told years back put only one brand of fuel in a vehicle, Is this just a myth?
I have a new 05 Expedition and work pays for my gas. Will it help or hurt if I run higher Octane gas? Also, I was told years back put only one brand of fuel in a vehicle, Is this just a myth?
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
Higher octane fuel has a higher autoignition temperature than a lower octane fuel. The expedition was tuned using 87 octane, so the timing curves are all set to be optimal for that octane fuel. The mixture ignite later in the cycle than was intended reducing performance and efficiency. If timing is advanced to fix this, it might run a little better due to the more advanced timing, but the fuel itself won't work any miracles.
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