87 octane versus 91 octane - Page 2 - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #11 of 19 (permalink) Old 05-14-2019, 11:06 PM
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I have run 89 (mid grade) in my 2014 Mazda 6 since it was new. Works GREAT and the fuel mileage should be slightly better than with 87 octane fuel. Well worth the tiny difference in cost/mile.
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post #12 of 19 (permalink) Old 05-15-2019, 12:23 AM
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If I were in your situation I would run the 87. The only thing you should be making sure of is you are using a "Top Tier" fuel station.


Where we are we get 87 or 91. We run 91 because of the turbo. Bought the car in part because of the extra power. The higher the octane the more HP/TQ. Wouldn't make much sense not to feed it. That and the 91 is only 20 cents @Gal more than 87. Less than $3 a tank for the 91 almost pays for itself with the slightly better gas mileage. Approx 1 mpg better for us.
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post #13 of 19 (permalink) Old 05-15-2019, 11:08 AM
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Originally Posted by johnnymg View Post
I have run 89 (mid grade) in my 2014 Mazda 6 since it was new. Works GREAT and the fuel mileage should be slightly better than with 87 octane fuel. Well worth the tiny difference in cost/mile.
I've been doing the same probably 90% of the time, unless the price difference for 89 feels too high.

I can't say my testing is scientific, but it seems to be good for about 1 MPG, and also seems to start/idle a little better when it's cold. That could be in my head though.

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post #14 of 19 (permalink) Old 05-15-2019, 12:13 PM Thread Starter
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I definitely will try 89 or 91 on my next fill up because it won't hurt to experiment and see the difference! Thanks for all the input guys

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post #15 of 19 (permalink) Old 05-15-2019, 03:15 PM
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Big difference here in price (~30 cents/gal for mid-grade and ANOTHER 20-30 cents/gal for 92/93!, so 50 cents/gal+ for "Premium") Not worth it. I have a 92 tune calibration file but don't load or use it due to the ridiculous price difference in the fuel here.

One thing I CAN tell you for certain though -- when out in the mountains "regular" is 85. The SkyActiv engine runs perfectly well on it and *that* makes a considerable difference in fuel economy -- +2-3mpg! So yeah, if I'm out there I buy it, and the car has no complaints running through the full tank I leave CO with when I get back into Texas at MUCH lower elevation either.....
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post #16 of 19 (permalink) Old 05-15-2019, 11:49 PM
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Regardless of what anyone else would do I would NEVER run anything less than 87, unless, I lived and were to be staying in the mile high city.

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post #17 of 19 (permalink) Old 05-16-2019, 12:52 AM
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Well, ok, you do what you want.

I have (more than once), my engine is still in one piece, I'm OVTuned, and by Ghod, I really enjoyed the additional distance I traveled on a given tank.

Again: You do what you want.
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post #18 of 19 (permalink) Old 05-16-2019, 08:42 AM
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post #19 of 19 (permalink) Old 05-18-2019, 08:46 PM
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Quote:
Originally Posted by Modzas6x View Post
I definitely will try 89 or 91 on my next fill up because it won't hurt to experiment and see the difference! Thanks for all the input guys
The only thing that's gonna hurt is your pocketbook.

https://cars.usnews.com/cars-trucks/...gular-gasoline


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