Can you run the Fiesta ST 1.6L on Regular 87 Octane?

[RBYM]

Can you run the Fiesta ST 1.6L on 87 octane and go full throttle safely? In CA all we have is a maximum of 91 octane but I rarely go full throttle. I just just wondering if it’s safe to go wot on 87 octane?

 

[Grsemky]

Yes factory maps allow 87 at reduced power, however I recommended staying with 91.. I'm in AZ with the same shitty gas and never used less than 91

 

[RBYM]

Yes factory maps allow 87 at reduced power, however I recommended staying with 91.. I'm in AZ with the same shitty gas and never used less than 91

Sweet thank you!

 

[Intuit]

If you're at high elevation, pay attention to the octane. 85 might still be sold as "regular"? If so, avoid it. 87 or higher. Higher elevations being less prone to knock, apply for naturally aspirated engines, but not necessarily for boosted engines.

 

[RBYM]

If you're at high elevation, pay attention to the octane. 85 might still be sold as "regular"? If so, avoid it. 87 or higher. Higher elevations being less prone to knock, apply for naturally aspirated engines, but not necessarily for boosted engines.

We have 87 as regular, we don’t have 85. But thank you!

 

[rallytaff]

I have only used 91 in my 2014 since Day 1.

 

[JAMADOR]

I did 87 for the first handful of tanks. Switched to 93 when I started getting a AFR imbalance CEL. Seemed to help for a few tanks but came back this weekend. Have a pair of new O2 sensors to install when I do the next oil change, along with a new set of plugs.

So far, MPG seems to be about the same between 87 & 93 [28-30]