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Hyundai Sonata Fuel and Fuel System Questions

55 messages,  Last post on Oct 02, 2009 at 6:38 PM

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What is this discussion about? Hyundai Sonata, Fuel System, Fuel System, Sedan

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#1 of 55 premium gas? by bill118 Mar 12, 2007 (3:28 pm)
My car is 2006 sonata GLS I4, do you guys think it is a good idea to upgrade to premium gas? Replies to this message: backy (Mar 12, 2007 3:46 pm) bhmr59 (Mar 12, 2007 6:19 pm) drdonrs (Mar 12, 2007 5:46 pm) jacknzone (Mar 13, 2007 3:50 am)
#2 of 55 Re: premium gas? [bill118] by backy Mar 12, 2007 (3:46 pm)
Replying to: bill118 (Mar 12, 2007 3:28 pm) Only if you like paying about 10 cents more per gallon for gas than you need to. The engine is designed to run on regular unleaded. Replies to this message: bhmr59 (Mar 12, 2007 6:19 pm)
#3 of 55 Re: premium gas? [bill118] by drdonrs Mar 12, 2007 (5:46 pm)
Replying to: bill118 (Mar 12, 2007 3:28 pm) why oh why would you even consider the proposition to switch to premium? The engine is controlled by a computer chip and is set for regular gas. Be happy that it is what it is. Even my Azzy also runs on regular. Of course you might want to make Exxon/Mobil and the other oil companies a little richer and your wallet a little thinner by an unnecessary switch.
#4 of 55 Re: premium gas? [backy] by bhmr59 Mar 12, 2007 (6:19 pm)
Replying to: backy (Mar 12, 2007 3:46 pm) Gee, you're lucky if you can get by wasting only 10 cents per gallon. In my area of CT the difference in price for premium is 20 cents per gallon.
#5 of 55 Re: premium gas? [bill118] by jacknzone Mar 13, 2007 (3:50 am)
Replying to: bill118 (Mar 12, 2007 3:28 pm) Hi Bill118  You may like to look at (Hyundai Sonata Real world MPG Numbers ) on page 61 #303 I found it was around about the same , I'm back using 91 octane, 95 is a $1.529 a litre here .
#6 of 55 What does the owner's manual recommend? by pat HOST Mar 13, 2007 (4:06 am)
Seems to me that provides the definitive answer. Replies to this message: joe97 (Mar 13, 2007 11:54 am) pat (Mar 13, 2007 11:59 am)
#7 of 55 Re: What does the owner's manual recommend? [pat] by joe97 Mar 13, 2007 (11:54 am)
Replying to: pat (Mar 13, 2007 4:06 am) Regular unleaded. Replies to this message: pat (Mar 13, 2007 11:59 am)
#8 of 55 Re: What does the owner's manual recommend? [joe97] by pat HOST Mar 13, 2007 (11:59 am)
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.
#9 of 55 What about 87 or 89? by effect18 Sep 11, 2007 (5:17 am)
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? Replies to this message: targettuning (Sep 12, 2007 5:03 am)
#10 of 55 Re: What about 87 or 89? [effect18] by targettuning Sep 12, 2007 (5:03 am)
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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