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Discussion Starter · #1 ·
Curious what experience others have had with doing this. Manual says 87 can be used, but to expect a bit less performance. Price difference between 87 and 93 octane here in NC is substantial - on the order of 60-80 cents per gallon more depending on the gas station. For just basic daily driving and such, I don't think the power gain from 93 is really needed. Has anyone else done any comparisons?
 

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**** no man
 

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I use 87 sometimes and I haven't noticed a difference in power. Fuel economy seems to be about the same. I read somewhere the difference is 5 less tq on 87 and that's about it.


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Lots of members run 87 on the stock tune and report no noticeable difference in performance during their commute. The torque and horsepower of the stock tune is pretty much the same on 87 as it is on 93 in the lower RPM range, and only above 3000 RPM does the benefit of 93 make a difference on the stock tune.
 

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Modded car, intercooler/intake/exhaust and currently running 87 on stock tune... runs fine. I see no difference in mpg or power for that matter.
 

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Any modern car can run on 87. I'm sorry but our Focuses are not high performance machines. They can get by just fine and they were designed that way.
 

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Curious what experience others have had with doing this. Manual says 87 can be used, but to expect a bit less performance. Price difference between 87 and 93 octane here in NC is substantial - on the order of 60-80 cents per gallon more depending on the gas station. For just basic daily driving and such, I don't think the power gain from 93 is really needed. Has anyone else done any comparisons?

Depends on how much you drive I guess.

10 gallons a week at 60 cents more per= 6 bucks a week X 52 weeks= 312 a year....Its about 80 cents more a day to run super ;-)

I am in NC to and agree the price difference is big but still works out ok. And my but dyno can tell a difference
 

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I ran 87 for my first six months of ownership, now ive been running 91 for the last few months. Maybe a little smoother but ultimately for commuting in stop & go, I'm going back to 87 and gonna spend the extra money on some mods.
 

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There is a new one of these threads literally every week. Ugh. @ddfred can we find a conclusive 87/91/93 octane war thread from past arguments and sticky it by chance so this stops happening? Lol it's only a matter of time before someone comments on this thread and says something and starts another war about it.
 

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Running 87 during winter because winter tires have no grip so I am not on it all the time. During the summer/warm weather I will switch back to 93. Because I drive it like I stole it.
 
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There is a new one of these threads literally every week. Ugh. @ddfred can we find a conclusive 87/91/93 octane war thread from past arguments and sticky it by chance so this stops happening? Lol it's only a matter of time before someone comments on this thread and says something and starts another war about it.
Did a quick google search (very quick); didn't see anything worth making a sticky. If you can find one let me know, but all I see look alot like this one.

https://www.google.com/webhp?source...#q=87+octane+focusst.org+site:www.focusst.org
 
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Its a common question thats why so many threads. Highly debatable like oil threads, sticky or not I think it will continue the trend. Doesn't hurt to try sticky, but I am doubtful it will change anything.
 

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I know the ST supplement in our manuals shows the power differences between 87 and 93 but says either can be used. I say the gas use is based on personal preference. I use 87 and then when I had a track day or autocross I made sure I ran it low and then filled with 93. During normal driving couldn't tell the difference between 87 and 93.
 

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Did a quick google search (very quick); didn't see anything worth making a sticky. If you can find one let me know, but all I see look alot like this one.

https://www.google.com/webhp?source...#q=87+octane+focusst.org+site:www.focusst.org
Two recent ones in the Discussion Sub-Thread which sum it up, still not sure if this is conclusive enough for a sticky. We need someone who is very knowledgeable like @p.opus or something to write up a really nice 1 post thread on the topic that's conclusive. Sticky it then close/redirect every new thread to that one for less fights and arguments lol.

http://www.focusst.org/forum/focus-st-discussions/77649-what-gas-run-focus-st.html
http://www.focusst.org/forum/focus-st-discussions/69874-new-here-what-gas-should-i-use.html
 

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Discussion Starter · #18 ·
Sorry, didn't mean to start a thing by posing the question. I tried searching the forum but apparently I didn't use the right terms in my search .. Didn't think to try "gas" lol. Regardless, I appreciate everyone jumping in :).
 

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I run 93 as a preventive measure, not to squeeze every possible lb-ft out of the engine. I may not notice it's pulling timing if I run 87, and I won't attempt to tell the difference via butt dyno, but I want to prevent what causes the timing pull before it happens....knock.

A technician friend of mine who also spent some time as a funny car mechanic explained knock as akin to striking your piston tops with a hammer. I want none of that. 93 isn't so prohibitively expensive in Texas that I can't justify a little prevention.
 
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