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Topic Review (Newest First)
Today 03:38 PM
sailor It's def. a 'results may vary' situation, and even the diff. between your local fuel at 91 vs. somewhere else at 93 can make a difference.

Heck, in some localities 93 is 100% gasoline with 87 being 90% (E10) so that can affect it as well - not just octane.

I mentioned the number of tanks for general reference since most have a LOT left in their tank when the light comes on. Mine comes on at about 9 gal. used, at least intermittently, out of 13 capacity and a max of 12 used for the LOWEST I ever took it.

9- 10 fresh with 4-3 remaining is a noticeable dilution.

For your use, in your region, it doesn't make sense to pay the extra.
Today 03:24 PM
Blackfocus86 Yea. I run my tanks down till the gas light comes on lol. I ran about 15 tanks of 91 and 15 or so 87 all calculated. Big difference also driving south to work and doing little trips up north. Going down to Newport Beach and back to la about 36mpg. Going up north to the valley then coming back to La about 41mpg. Amazing stuff huh lol. But definitely no difference in mpg. Waste of money. As far as far running better on 91 from the pants on the seat felt the same to me. Then again I don't go racing or driving quick
Today 02:24 PM
sailor It's not easy to get a good comparison, have to change over and run something different for a number of tanks before getting any decent comparison.

Initially it's just a partial one, since the fuel is mixing with what was already in use.

Often a fair variation without a change as well, just due to different driving done on each tank full.
Today 02:12 PM
Blackfocus86 I've ran 87 and 91 from 76 here in Cali Los Angeles. Same gas station same commute to work. Tried 91 cause I read someone here got a 4mpg increase. What a bunch of bull my mpg was the same with both gas lol. I manually calculated my mpg with 95percent highway at just over 70mph 36mpg with both gas. Will also add how inaccurate the mpg calculator the car has is. Been off anywhere from half a mile to 11 miles off lol.
Yesterday 11:19 PM
Slicknick I ran 87 when I was strapped for cash, the reason I bought the focus, but now I paid the car off. The car ran just, well...okay. I never thought I would be running 93 in this car but after I got a few mods and a tune I had to try it. Premium will cost me an extra $250 a year and it is worth it for me.

If you plan to keep the car for awhile, which I do, I would get a 93 tune. Car runs spectacular!
Yesterday 05:44 PM
DJTrollin I was using 87 but was getting a slight staggered pinging noise when I opened the car up. Switched to 93 and the sound has went away. Currently intake, headers, Tom's tune and exhaust.

Sent from my MotoG3 using FF Mobile
Yesterday 05:26 PM
Jburks you have 300k miles on your car?!
Yesterday 04:17 PM
((( 89 )))

I use 89 octane in my 2013 SE. It takes a couple tanks for the computer to get use to the higher spirits. Best money one can throw at the FF beside full synthetic. 300,000 miles, she's hummin' right along ....!
12-30-2016 04:45 PM
Lash LaRue

It is not "snake oil" as you call it. You appear to be ignorant of the engineering that went into the Ti-VCT engine...

Ti-VCT stands for, "Twin, independent Variable Cam Timing". There are two overhead cams that operate the valvetrain in your car. There are, additionally, two knock sensors per cylinder that are designed to automagically (via oil pressure solenoid) adjust engine timing depending on the knock-index of fuel that you put into your car.

If you put in el-cheapo fuel, the engine will retard its own timing to prevent pre-ignition and knock (i.e. it will not destroy itself). So, to be clear, it WILL run just fine on 87 octane. BUT if you give it a higher octane, the engine will automatically advance timing to give you a slight performance gain. Whether that's worth the marginal increase in cost is completely open for debate, but the engineering that went into your engine is not debatable; it simply is what it is:

My own experiences are that premium fuel results in a modest, incremental performance gain. I have a 5-sp manual, and with premium I can generally keep my RPM's much lower without having to downshift. This means I can also pull hills in top gear that don't otherwise require me to downshift or lug the engine. This does result in some additional fuel economy (I have had a CDL for years, work in logistics, and happen to be a subject matter expert in this area).

As an aside, over the lifespan of your engine, lugging === bad. If you're able to prevent that with a higher grade of fuel (as I am able to do), you will probably get a few more miles out of it, so there may be indirect benefits there as well.

Originally Posted by Tigeo View Post
This is verging on snake oil folks. Premium is still ~$0.40 or more than regular here in VA at Top-Tier stations – less delta at the discount vendors like grocery stores. I believe that most of the difference people notice is placebo (butt dyno and ticking noises). I also think that there is *some* improvement but it’s not as drastic as “I filled up with premium for the first time and got 5 more mpg!” – B.S. These cars are designed to run on regular. Premium is simply more octane which allows higher combustion pressure to be tolerated before detonation. Yes, I realize our little cars have high-combustion ratio motors but they have been designed to run with regular. I used to only run regular as I was driving ~30K/year (mainly highway) and the $0.40/gal over ~1000 gallons of gas annually adds up. $400 is a lot of money for what was zero added benefit. Now I only drive my car ~5K/year (if that) and its mainly city. I am at less than 200 gallons annually so now talking $80 extra a year to run premium. I do notice (could be placebo) that during the summer, in town, with the A/C on, that it seems to take off easier with premium and that is the only advantage I have felt.
12-15-2016 01:31 PM
cavedog309 88584 miles all Premium and most Non Ethanol .60$ more but this Little car will just shi* and Git throu the Twisties, Still Amazing while delivering 33 to 38 mpg. Here in the Northeast they put what they call oxygneators in the gas for the cold weather , You can see the fuel mileage dipp in the winter and oh about april march it will go back to 37 , 38 MPG.
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