- #6 of 55
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What does the owner's manual recommend?
by pat HOST
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Mar 13, 2007 (4:06 am)
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Seems to me that provides the definitive answer.
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- #7 of 55
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Re: What does the owner's manual recommend? [pat]
by joe97
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Mar 13, 2007 (11:54 am)
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Replying to: pat (Mar 13, 2007 4:06 am)
Regular unleaded.
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- #8 of 55
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Re: What does the owner's manual recommend? [joe97]
by pat HOST
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Mar 13, 2007 (11:59 am)
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Replying to: joe97 (Mar 13, 2007 11:54 am)
Then, as noted earlier, it's only a waste of money to burn premium. The engine is not built to take advantage of it as everyone has noted.
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- #9 of 55
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What about 87 or 89?
by effect18
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Sep 11, 2007 (5:17 am)
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I have a 2007 Sonata Platinum ediiton. In the manual it says 87 or 89. I've been using 87 but have noticed minor engine knock. I took it to the dealer and they said this was normal, and will decrease over time since the car hasn't been broken in yet(I only have 700 miles on it).
My wife recently(a few weeks ago) bought a 2007 Elantra SE. She mistakingly filled up with 89 one day. She told me of her error, and I told her next time use 87. When she filled up the next time with 87, she and I noticed the minor engine knock that my car had been experiencing. Not sure if this is how all Hyundia's are supposed to sound since these are our first Hyundia's. But I'm gonna fill up next time with 89 and see if my engine runs better.
Any suggestions/experiences?
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- #10 of 55
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Re: What about 87 or 89? [effect18]
by targettuning
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Sep 12, 2007 (5:03 am)
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Replying to: effect18 (Sep 11, 2007 5:17 am)
You could try 89 octane but that is still a couple cents more than regular. With regard to the "knock" there should be none on either car using regular. There is, on both cars, a knock sensor that constantly fine tunes the timing and retards it if it detects any detonation (knock). It has been a very long time since new cars "knocked" so maybe what you hear (although it is hard to hear it inside) are the fuel injectors activating. They tick or click all the time and are audible at idle.
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- #11 of 55
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Switched to Premium
by effect18
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Sep 23, 2007 (7:59 am)
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I took a second look at my maunual and it says for the 2007 Sonata that gas of octain 87 or higher can be used. So i filled up with premium yesterday, and i'll let you guys know if I notice any difference.
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- #12 of 55
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Re: Switched to Premium [effect18]
by targettuning
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Sep 24, 2007 (5:31 am)
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Replying to: effect18 (Sep 23, 2007 7:59 am)
Sure, you can use any grade gas but Hyundai sets the minimum when they state 87 octain. The "or higher" part of that statement is purely optional (Hyundai is NOT saying you can't use it) so, yes, you can spend more for premium but I,like others here,say it is a waste of $$$.
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- #13 of 55
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Re: Switched to Premium [targettuning]
by bj02176
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Sep 28, 2007 (2:52 pm)
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Replying to: targettuning (Sep 24, 2007 5:31 am)
It may be a waste of money on the bigger engine, but not on th 2.7 awd, try 89 or higher and see if you do not feel more confident merging on rt 128 with it versus 87. No better gas mileage however.
I thought they were saying in the manual to use 91 or higher for better performance, I could be wrong, but I think that is what it says in mine, and a true statement if that is indeed what it says.
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- #14 of 55
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Re: Switched to Premium [bj02176]
by targettuning
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Oct 01, 2007 (5:43 am)
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Replying to: bj02176 (Sep 28, 2007 2:52 pm)
At one time we owned a 2002 Santa Fe with the 2.7 V-6 and AWD. Since I don't own it any longer I can't do the test you suggest but I never used anything other than 87 in it and don't recall any reason I should have upgraded to 89. I personally don't belive the minor increase in octane from 87 to 89 makes any appreciable difference in vehicle performance and ,for sure, none in fuel economy. It is, especially now, a waste of money for the vast majority of new cars owners. In fact, since probably 98% of all new cars are designed for regular (87 octane) and run perfectly well with it I can't understand why three grades are still available. Aside from some high end luxury cars, some luxury SUV's and very high performance cars premium (92 octane) is pretty much unneeded. You may gain optimal performance with those engines designed for premium if you use it but I'll bet not 1 in 100 Corvette owners could tell the difference if they used mid-grade instead and "lost" a few hp because the engine management computer "dialed back" a few design parameters because of it. Those engines are so massively powerful anyhow nobody would notice.
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- #15 of 55
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Re: Switched to Premium [targettuning]
by bj02176
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Oct 01, 2007 (2:52 pm)
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Replying to: targettuning (Oct 01, 2007 5:43 am)
I think they retuned the engine, however if you want to merge on rt 128 with just using 87 be my guest, around town the sluggish 87 is fine, but for highway merging 89 alternated with the next higher grade performs best. Just get the bigger engine and be done with.
Or get a CRV 4 cyl which I believe will accelerate just as well as 2.7 hyundai on 87, and better gas mileage to boot.
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