For a fact the more octane the more power you car puts out...except for sum new cars that you would mess up the fuel system by just putting 93octane...some mechanics tell me to put w.e gas your car manufacturer recommends....others say just put the premium , get better gas milage and motor wont knock and runs healthier...whats the real truth behind all these myths and theorys and crap...

 

Higher octane fuel doesn't actually have more energy. You can only get more power because higher octane allows you to have higher compression ratio, higher boost (if you have FI) or more spark advance. THOSE things give you more power.

The only way you'll get more power; is IF your engine & ECU are configured or programmed to take advantage of this.

 

As per https://honda-tech.com/zerothread?id=1561388

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ChillOutWayne &raquo;</TD></TR><TR><TD CLASS="quote">This is just plain retarded, please read on for explanation.

People need to understand. A lower octane fuel does not burn any less "efficient" than a higher octane. In fact, if efficiency is rated on how easily a fuel will burn, then the 87 is the most efficient, because it takes the least amount of compression and temperature to burn. The higher octane simply raises the threshold at which the burning process begins. Thus you have a forced inducted or higher compression (over 10:1 motor) and it requires 91 or 93 octane because a lower octane fuel will actually burn prematurely, due to the compression threshold of that fuel being reached earlier in the power stroke, thus you get pre-ignition, or ping.

Bottom line, only run premium if your vehicle needs it, otherwise its techinically more work for a engine designed to run 87 to run 93. </TD></TR></TABLE>

 

The higher the octane, the slower the fuel burns. Higher octane allows for higher compression. Unless you have raised or lowered your compression, use manufacturer recomended octane. Spray or boost will also call for higher octane.

 

use man. recommendation, unless you bumped compression or add f/i then upgrade to higher octane.

 

Burning a higher octane then recomended on an unmodified engine will force the ecu to advance the timing to get ignition. This will result in poor gas milage and throttle responce. Lower octane then recomended will set off the knock sensor and force the ecu to retard timing. Again, poor milage and drivability.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Double Agent &raquo;</TD></TR><TR><TD CLASS="quote">Burning a higher octane then recomended on an unmodified engine will force the ecu to advance the timing to get ignition. This will result in poor gas milage and throttle responce.</TD></TR></TABLE>

This is not true. The ECU has no way of knowing in the first place if the octane is higher than the minimum recommended. And getting lower power or more sluggish throttle response does not occur when running fuel of too high an octane rating. As many (myself included) have confirmed, running a fuel of higher octane than is needed results in nothing more than increased expense. No power loss occurs.

 

Actually, if the octane is too high, full combustion cannot be achieved. The reduces gas millage. Also, because not all the fuel is being used to propell the car you do lose a little power. The unburned fuel is detected by the O2 sensor, and the engine advances the timing to achieve combustion.

 

The fuel is still being used up. Octane isn't a measure of how much fuel there is-- in simplicity, it is the fuel's ability to resist detonation. If you're talking about fuel being left over because full combustion is not achieved, that would only happen if you're running an octane WAY over what the ECU is programmed for.

 

<U>honestly</U> i just dont really know anything about the octanes but i run 93 and have been for a year or so .. id like to say it responds better to 93 than 87 but im afraid its prolly in my head


so lets do some math
10 gallons at 2.25 each =22.50 for 87
10 gallons at 2.45 each =24.50 for 93

some say its a waste but its only 2 bucks more .. and i only get gas about every 2 weeks .. i say just get what you can afford unless your boosted or running a h/c .(as others have said above me) ..

 

The better question would be which brand of Gas do you know is better. Anybody seen any difference on a wideband in burn quality using a different brand of gas. I know each Gasoline producer; Sunoco, Mobil, Exxon, BP, Shell all have different additives that they claim keep the engine cleaner.

I have seen a difference in using 93 BP and using 93 Shell or Sunoco. The BP stuff actually caused slight detonation on 10psi stock compression B16 at 9000rpm... This was maybe 2 pings then I shut off and got some octane booster and added it to the mix... No more 9000 dets.

 

this is true sunoco gas is the shizzle