Fuel Question - RX8Club.com



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Old 07-30-2007, 12:20 AM   #1
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Fuel Question

Do I have to always use primium fuel when I fill up?

I just bought my dream car but this was not brought up during the purchase.

Thanks for your help!
Steve
Orlando
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Old 07-30-2007, 12:24 AM   #2
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Quote:
Originally Posted by ucfsteve33 View Post
Do I have to always use primium fuel when I fill up?

I just bought my dream car but this was not brought up during the purchase.

Thanks for your help!
Steve
Orlando
I use NOTHING but Premium.
Now get ready for the debate and the flamethrower.
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Old 07-30-2007, 01:04 AM   #3
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Read your owners manu.
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Old 07-30-2007, 05:40 AM   #4
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Premium it's what they tell you to use , so I do .
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Old 07-30-2007, 05:47 AM   #5
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Canola is what I use

I use Olive Oil sometimes.
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Old 07-30-2007, 06:29 AM   #6
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Been discussed many times over but..................

Due to the engines combustion characteristics, it has excellent low octane tolerance. So much so that a piston engine would "ping" & die if the user tried to drive it.

Having said that, I run my personal RX-8 on the low octane stuff with no trouble however many users report a difference on the higher octane.

Try them all for yourself & choose what you think is best.

Due to the artifical compression increase fromthe turbo's on my Cosmo, I use the high end stuff as "insurance" just in case but it really boils down to your personal opinion.

REgards
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Old 07-30-2007, 08:28 AM   #7
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While you can use a lower octane (91, 89, or even 87), it is manufacturer recommended to use 93. It's all I use. Some people have experienced "pinging" with lower octane fuels, many have not. I would never use less than 93 only because you are going against manufacturers recommendations, so when it comes to warranty work, there's always the possibility of them denying the work as a result.
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Old 07-30-2007, 01:03 PM   #8
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Originally Posted by Huskyfan23 View Post
While you can use a lower octane (91, 89, or even 87), it is manufacturer recommended to use 93. It's all I use. Some people have experienced "pinging" with lower octane fuels, many have not. I would never use less than 93 only because you are going against manufacturers recommendations, so when it comes to warranty work, there's always the possibility of them denying the work as a result.
The warranty is probably the biggest issue IMHO (Like HuskyFan23 posted). Plus, its best to stick with what the manufacturer recommends. Over here in Arizona you can only get 91 Octane fuel, 93 Octane isn't available. So there is *some* room to fudge.

Basically all Gas is pretty much the same. Octane stabalizes the fuel so it detonates when it should. Higher Octane = more stable detonation. In some states Ethanol (or similar grain fuel) is added at different times of the year. This also has a stabalizing effect which may be why people don't report pinging issues with lower octane fuel.

If you look at the real cost, Premium fuel typically costs about $4-$5 more per tank full. While you can get away with lower octane fuel Premium will get you better performance and slightly better gas mileage than just plain 87 Octane.

So, stick with the High Octane fuel.
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Old 07-30-2007, 02:37 PM   #9
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No more Detonation! *MIAC*


If it doesn't ping, use reg.
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Old 07-30-2007, 04:36 PM   #10
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Originally Posted by MrCairo View Post
The warranty is probably the biggest issue IMHO (Like HuskyFan23 posted). Plus, its best to stick with what the manufacturer recommends. Over here in Arizona you can only get 91 Octane fuel, 93 Octane isn't available. So there is *some* room to fudge.

Basically all Gas is pretty much the same. Octane stabalizes the fuel so it detonates when it should. Higher Octane = more stable detonation. In some states Ethanol (or similar grain fuel) is added at different times of the year. This also has a stabalizing effect which may be why people don't report pinging issues with lower octane fuel.

If you look at the real cost, Premium fuel typically costs about $4-$5 more per tank full. While you can get away with lower octane fuel Premium will get you better performance and slightly better gas mileage than just plain 87 Octane.

So, stick with the High Octane fuel.
MrCairo
What do base your statement on? Some people have dynoed higher hp(Without Pinging) using 87 with improved fuel mileage,
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Old 07-30-2007, 04:40 PM   #11
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93 is hard to find in California...
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Old 07-30-2007, 04:54 PM   #12
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93...?

The owner's manual recommends 91, not 93. It also says you can use lower, down to 87, "but this will slightly reduce performance."

I use 93, because a) I drink lots of Kool-aid and believe in the book, and b) pumps around here have 87, 89 and 93. I'm not **** enough to fill 50/50 with 89 and 93.

Quote:
In some states Ethanol (or similar grain fuel) is added at different times of the year. This also has a stabalizing effect which may be why people don't report pinging issues with lower octane fuel.
There are seasonal changes in gas, but ethanol is not one of them. Ethanol is in fuel in the US for political reasons.

Ken
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Old 07-30-2007, 04:58 PM   #13
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Quote:
Originally Posted by Huskyfan23 View Post
While you can use a lower octane (91, 89, or even 87), it is manufacturer recommended to use 93. It's all I use. Some people have experienced "pinging" with lower octane fuels, many have not. I would never use less than 93 only because you are going against manufacturers recommendations, so when it comes to warranty work, there's always the possibility of them denying the work as a result.
The manual suggests 91+. In some states (California) you can't get 93 at regular pumps and 91 is considered premium.

I use 93 here in Florida, and I would suggest you use premium too.
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Old 07-30-2007, 09:48 PM   #14
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Thanks again for your help!
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