Fuel grade
Senior Member
Joined: Nov 2008
Posts: 2,726
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From: southern New Hampshire
Au contraire, mon frère. With a high compression naturally aspirated engine or a forced induction engine (supercharged or turbocharged) which is, by definition, high compression, higher octane gas will give more power. That oil company employee must have been speaking of "normal compression" engines where, true. it would be wasted money.
When I owned the last generation twin turbo RX-7 I found a great increase in power using costly 100n octane fuel. And how I loved the unique aroma of that potion!
They should make a man's cologne out of it.
Eric B.
When I owned the last generation twin turbo RX-7 I found a great increase in power using costly 100n octane fuel. And how I loved the unique aroma of that potion!
They should make a man's cologne out of it.
Eric B.
Relative to your RX-7; entirely different engine architecture, as for power increases from 100 AKI fuel (note there is no such a thing as 100 octane automotive fuel here in North America); I highly doubt there were any gains unless you were able to fit an aftermarket computer to the engine.
Banned
Joined: Dec 2016
Posts: 484
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From: Northern Illinois
I cannot find any info on this in the forum so I'm posting a new question. I know Mazda recommends using Regular fuel in the CX-5 but I'm getting crappy mileage in town, roughly 19.5 mpg.
I thought I'd try Premium but made no difference but now it runs like a race car.
So I've got 2 questions:
1 Am I doing any harm to the engine running Premium?
2 If I add something like a K&N air filter will that improve things like mileage?
Thanks, Mike
I thought I'd try Premium but made no difference but now it runs like a race car.
So I've got 2 questions:
1 Am I doing any harm to the engine running Premium?
2 If I add something like a K&N air filter will that improve things like mileage?
Thanks, Mike
Last edited by Conrad 16.5; Aug 7, 2019 at 08:04 AM.
Senior Member
Joined: May 2019
Posts: 137
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From: Where you live
Mazda designed the NA 2.5L to run on regular octane. The spread between regular and premium is about 70 cents a gallon where I live, which does add up. Buying premium on the NA 2.5 is literally lighting money on fire.
Senior Member
Joined: Jan 2018
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From: United States
Agreed. Where I live the delta between regular and premium is high as well. So I go with regular.
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Joined: Aug 2019
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From: Missouri
Hi.. First post
I like saving money.. but since I switched from 87 to 89 (mid grade) for my 2019 CX-5 GT, I immediately noticed (why I tried it in the first place) faster starts and less hesitancy. The difference is subtle, but appreciated and worth the 10 cents extra per gallon.
I like saving money.. but since I switched from 87 to 89 (mid grade) for my 2019 CX-5 GT, I immediately noticed (why I tried it in the first place) faster starts and less hesitancy. The difference is subtle, but appreciated and worth the 10 cents extra per gallon.
Senior Member
Joined: Nov 2008
Posts: 2,726
Likes: 0
From: southern New Hampshire
Hi.. First post
I like saving money.. but since I switched from 87 to 89 (mid grade) for my 2019 CX-5 GT, I immediately noticed (why I tried it in the first place) faster starts and less hesitancy. The difference is subtle, but appreciated and worth the 10 cents extra per gallon.
I like saving money.. but since I switched from 87 to 89 (mid grade) for my 2019 CX-5 GT, I immediately noticed (why I tried it in the first place) faster starts and less hesitancy. The difference is subtle, but appreciated and worth the 10 cents extra per gallon.
Senior Member
Joined: Nov 2008
Posts: 2,726
Likes: 0
From: southern New Hampshire
I don't believe anybody has said otherwise. What we have said is to use fuel of a higher AKI than specified by Mazda will not provide you with any performance benefit.
Banned
Joined: Dec 2016
Posts: 484
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From: Northern Illinois
Hi.. First post
I like saving money.. but since I switched from 87 to 89 (mid grade) for my 2019 CX-5 GT, I immediately noticed (why I tried it in the first place) faster starts and less hesitancy. The difference is subtle, but appreciated and worth the 10 cents extra per gallon.
I like saving money.. but since I switched from 87 to 89 (mid grade) for my 2019 CX-5 GT, I immediately noticed (why I tried it in the first place) faster starts and less hesitancy. The difference is subtle, but appreciated and worth the 10 cents extra per gallon.