87 Octane is it needed everywhere

[Outforawalk]

Ok guys I know it has been discussed before but I need some advice clarification. Here we go.

#1 Yes I know that 87 min octane is recomended

#2 I have been told by many people that is a sea level requirement

#3 I currently live at about 3,000 ft level Southern UT

#4 95% of the gas stations around here carry 85 Octane with 88 octane as mid grade.

#5 I have been told that 85 Octane is good enough to use because of the elavation

TRUE or FALSE

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[Mavster Mechanic]

The HYBRID is OK with 85.

Been using it in a hybrid since 2005.

The Atkinson engine specifically means you can use lower octane.

 

[Carlitos_92]

Ok guys I know it has been discussed before but I need some advice clarification. Here we go.

#1 Yes I know that 87 min octane is recomended

#2 I have been told by many people that is a sea level requirement

#3 I currently live at about 3,000 ft level Southern UT

#4 95% of the gas stations around here carry 85 Octane with 88 octane as mid grade.

#5 I have been told that 85 Octane is good enough to use because of the elavation

TRUE or FALSE

The manual is clear on this. Minimum 87 octane is not a "recommendation."

Just because "many people" believe something doesn't mean it is true, especially if they aren't warrantying your truck.

 

[Ecorydr]

From Web:

"Yes, it is generally safe to burn 85 octane at high elevations (above 4,000–5,000 feet) in naturally aspirated engines that recommend 87. Because the thinner air reduces cylinder pressure, the likelihood of engine knocking drops significantly. However, you may experience a slight drop in fuel economy and acceleration.Why 85 Octane is Sold at High AltitudesIn mountainous regions, the atmospheric pressure is lower, which means there is less oxygen available for combustion.Naturally Aspirated Engines: The lower air density means the engine pulls in less air, lowering the compression in the cylinders. Because of this, the fuel doesn't need to resist pre-ignition as much, and 85 octane behaves similarly to 87 octane at sea level.Modern ECU Adjustments: Modern vehicles use an Engine Control Unit (ECU) equipped with knock sensors. If the computer detects the lower octane attempting to cause premature ignition (pinging), it will automatically retard the ignition timing to protect the motor.

While 85 octane is safe in a pinch, it is highly recommended to stick with your OEM-recommended 87 octane if any of the following apply:

• Turbocharged or Supercharged Engines: Forced-induction engines compress the incoming thin air, maintaining normal cylinder pressures. They still require the manufacturer-specified octane to avoid severe internal damage.
• Towing or Hauling Heavy Loads: Putting extra stress on your engine increases combustion temperatures, where the benefits of 87 octane are still needed to prevent knocking.
• You are Traveling to Lower Elevations: If you fill up on 85 octane and drive down to sea level, your engine will be highly prone to dangerous pre-ignition and knocking as air pressure increases.

Expert Consensus & Recommendations
Industry experts and mechanics generally urge drivers to follow the Owner's Manual Fuel Recommendation as the ultimate rule. Automotive authorities like General Motors have stated they do not endorse using 85 octane because it can force the engine to fight against its own safety sensors, reducing overall engine longevity and performance over time. "

Would probably step up to the 88 octane myself.... but.....

 

[Mavster Mechanic]

PS 3500ft is usually when stations switch to 85.

 

[Mavster Mechanic]

The manual is clear on this. Minimum 87 octane is not a "recommendation."

Just because "many people" believe something doesn't mean it is true, especially if they aren't warrantying your truck.

That was copied and pasted by FORD as common boilerplate for all vehicles.

My manual also tells me to check the under hood battery in my Maverick. I don't have an under hood battery.

 

[Mavster Mechanic]

Since you are not in Denver or above, and you are not really that high up, 87-88 may be worth it to you.

When I lived in Denver, I used 85 exclusively in my Ford Hybrids.

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