2017~2024 Fuel Grade

Pitter said:

I have read that with the 2.5 motor using Extra vs Regular gas contributes nothing to performance whatsoever. However according to Mazda the turbo motor will produce 227 hp on regular but 250 hp on extra. Quite a difference. So is it only the turbo that can take advantage of higher octane fuel?

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Sig cx-5 said:

Pitter said:

I have read that with the 2.5 motor using Extra vs Regular gas contributes nothing to performance whatsoever. However according to Mazda the turbo motor will produce 227 hp on regular but 250 hp on extra. Quite a difference. So is it only the turbo that can take advantage of higher octane fuel?

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Yes, only the turbo and then, only over ~4k RPM.

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shadonoz said:

Here's the torque curve:

source: https://www.thetruthaboutcars.com/2018/12/2019-mazda-cx-5-turbo-first-drive-your-italian-alternative/

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Pitter said:

I have read that with the 2.5 motor using Extra vs Regular gas contributes nothing to performance whatsoever. However according to Mazda the turbo motor will produce 227 hp on regular but 250 hp on extra. Quite a difference. So is it only the turbo that can take advantage of higher octane fuel?

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mazdadude said:

YES! The NA motor will also make more HP on higher octane, as the ECU adjusts the timing to control knock, and it can advance the timing more on the higher octane fuel.

Mazda only publishes the figures for the NA motor based on the low 87 octane. However independent dyno testing of the 2.0 Skyactiv motor shows the Mazda gains several HP with higher octane fuel, as the ECU adjusts the timing as available by the fuel and knock.

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mazdadude said:

YES! The NA motor will also make more HP on higher octane, as the ECU adjusts the timing to control knock, and it can advance the timing more on the higher octane fuel.

Mazda only publishes the figures for the NA motor based on the low 87 octane. However independent dyno testing of the 2.0 Skyactiv motor shows the Mazda gains several HP with higher octane fuel, as the ECU adjusts the timing as available by the fuel and knock.

Click to expand...

mazdadude said:

YES! The NA motor will also make more HP on higher octane, as the ECU adjusts the timing to control knock, and it can advance the timing more on the higher octane fuel.

Mazda only publishes the figures for the NA motor based on the low 87 octane. However independent dyno testing of the 2.0 Skyactiv motor shows the Mazda gains several HP with higher octane fuel, as the ECU adjusts the timing as available by the fuel and knock.

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madar said:

It won't make MORE horsepower, it'll keep the timing from retarding in conditions like hot dry weather so as to keep it's current power.

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madar said:

mazdadude said:

YES! The NA motor will also make more HP on higher octane, as the ECU adjusts the timing to control knock, and it can advance the timing more on the higher octane fuel.

Mazda only publishes the figures for the NA motor based on the low 87 octane. However independent dyno testing of the 2.0 Skyactiv motor shows the Mazda gains several HP with higher octane fuel, as the ECU adjusts the timing as available by the fuel and knock.

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It won't make MORE horsepower, it'll keep the timing from retarding in conditions like hot dry weather so as to keep it's current power.

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shadonoz said:

I'd love to see those charts if you've got em.

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mazdadude said:

I have posted them every time this question gets answered incorrectly here. I on the other hand, I believe the data, the dyno, the science, and Dave Coleman.

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ColoradoDriver said:

Yep I remember that being posted. I think end of the day the cost of premium fuel for what you get is not worth it. If you really want to go that route, get your CX-5 tuned for 91 or 93 octane (depending on your area).

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