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15 Posts
hello!! i always fill my ex with the 91 octane with gasoline mix w/up to 10% ethanol and the manual states that this is ok, but anyone else use the same or do you prefer the regular gasoline? if so why?
ethanol and gasoline mix
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533 Posts
I just run 93 octane and get some really descent results... Never have used or even considered Ethanol...
I have an ex too, and have been asking myself if its worth putting high octane fuel!
It seems that if your engine is pinging or it pre-ignites, then you need to use higher octane fuel. i just read this here, in CanadianDriver, a reliable source of info.
the only question is: is the ex engine susceptible to pre-ignite? does anyone know? How do you find out if your engine pre-ignites?
It seems that if your engine is pinging or it pre-ignites, then you need to use higher octane fuel. i just read this here, in CanadianDriver, a reliable source of info.
the only question is: is the ex engine susceptible to pre-ignite? does anyone know? How do you find out if your engine pre-ignites?
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976 Posts
Most modern engines have KNOCK sensor and will retard timming if they pre-detonate. Just not sure about Forte...... I use regular because there's no use for "slower" fuel and it cost too much for little gain!
If I was racing my Koup than it will be a different story!!
My 2 cent!
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108 Posts
rpps -
Here in the good old US of A, we generally do not have access to 95 octane fuel. The best at most pumps across the nation is 93 octane, which is at least 20 cents if not 25 to 30 cents more per gallon (silly how we stubbornly refuse to nationally convert to metric...). I drive a 2010 Forte SX 2.4L with the Sportmatic 5-speed automatic transmission.
For whatever performance gains we might get from the increase in octane (as the Forte line is NOT designed for higher-octane fuel), it isn't cost-effective considering the increased price we'd end up paying for a full tank of gas.
Now.... at one time I had a 1988 Chrysler LeBaron GTC Coupe with a 2.0 Turbo with a 5-speed manual tranny. 93 Octane was REQUIRED in that engine, as it had a higher compression ratio than the non-turbo. Using any fuel LESS than the 93 octane caused pre-ignition, which the knock sensors detected, and resulted in the engine management computer retarding the spark, which would stop the pre-ignition, and then result in a lot LESS horsepower delivered to the wheels.
Just to refresh everyone's memory: Higher octane does NOT mean MORE POWER; it provides higher resistance to pre-ignition. If YOUR engine does not REQUIRE higher octane fuel (like the entire Forte line does not), then using above-87 octane won't do much but lower the amount of cash in your wallet faster.
Perhaps one day I'll go wild and fill my tank with 93 octane. As the SX has the instantaneous MPG gauge function, I'll be able to see any performance difference quite quickly. At the end of the tank, I'll switch it to average MPG and see if 93 octane has made any difference. If I should suddenly see a 3 to 5 MPG INCREASE, I'd be sure to do the math and see if it's worth it in the long run.
All of us can try doing this. Fill up with regular, drive it a FULL tank's worth, then fill up with 93 octane, and do the same thing. If you see a major performance difference, or major MPG difference, write back in this thread and let us ALL know. Be sure to include your model, engine, and transmission.
Just my humble thoughts....
Here in the good old US of A, we generally do not have access to 95 octane fuel. The best at most pumps across the nation is 93 octane, which is at least 20 cents if not 25 to 30 cents more per gallon (silly how we stubbornly refuse to nationally convert to metric...). I drive a 2010 Forte SX 2.4L with the Sportmatic 5-speed automatic transmission.
For whatever performance gains we might get from the increase in octane (as the Forte line is NOT designed for higher-octane fuel), it isn't cost-effective considering the increased price we'd end up paying for a full tank of gas.
Now.... at one time I had a 1988 Chrysler LeBaron GTC Coupe with a 2.0 Turbo with a 5-speed manual tranny. 93 Octane was REQUIRED in that engine, as it had a higher compression ratio than the non-turbo. Using any fuel LESS than the 93 octane caused pre-ignition, which the knock sensors detected, and resulted in the engine management computer retarding the spark, which would stop the pre-ignition, and then result in a lot LESS horsepower delivered to the wheels.
Just to refresh everyone's memory: Higher octane does NOT mean MORE POWER; it provides higher resistance to pre-ignition. If YOUR engine does not REQUIRE higher octane fuel (like the entire Forte line does not), then using above-87 octane won't do much but lower the amount of cash in your wallet faster.
Perhaps one day I'll go wild and fill my tank with 93 octane. As the SX has the instantaneous MPG gauge function, I'll be able to see any performance difference quite quickly. At the end of the tank, I'll switch it to average MPG and see if 93 octane has made any difference. If I should suddenly see a 3 to 5 MPG INCREASE, I'd be sure to do the math and see if it's worth it in the long run.
All of us can try doing this. Fill up with regular, drive it a FULL tank's worth, then fill up with 93 octane, and do the same thing. If you see a major performance difference, or major MPG difference, write back in this thread and let us ALL know. Be sure to include your model, engine, and transmission.
Just my humble thoughts....
2021 Forte GT w/GT2, Currant Red, Wagner-Tuning Intercooler, Evilla Exhaust, Takeda S1 Intake
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6,969 Posts
I've tried 93, 89 and 87 octane fuels and my Bu## dyno didn't feel a difference...in fact, I felt as if the 93 octane made the engine feel sluggish and not rev as quick. When I merge onto the interstate I have to let off on the throttle as both my sedan SX and Koup SX hit 70 MPH before I get to the end of the merge lane -- so the 87 octane fuel works fine. I have been getting very good gas mileage out of the 87 octane so I no longer use the higher octane fuels.
Here in FL most gas stations have 10% ethanol. I haven't been able to feel a difference with and without it (especially in normal driving). I would imagine if you were to go to a dragstrip you might see a difference of a few tenths of a second -- since ethanol doesn't burn as hot in the engine.
If you have a preignition problem (pinging) when accelerating you should have your car looked at. Of course, you could also be buying gas that isn't up to 87 octane too!
Here in FL most gas stations have 10% ethanol. I haven't been able to feel a difference with and without it (especially in normal driving). I would imagine if you were to go to a dragstrip you might see a difference of a few tenths of a second -- since ethanol doesn't burn as hot in the engine.
If you have a preignition problem (pinging) when accelerating you should have your car looked at. Of course, you could also be buying gas that isn't up to 87 octane too!
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