Just stick with premium, it says so on the gas cap and in the manual. Also if premium gas was 4.00 a gallon and we have a 20 gallon tank, if plus is 3.80 its only 4 bucks more for premium. You really dont save that much money.
If you move down to a lower octane, you may encounter a bit of knocking, esp. at low rpm. When the engine senses the knowcking, it will quickly compensate by backing off on the timing a bit. This in turn will cost you a little bit of power.
To give a feel for how much power is lost- when Hyundai launched their Genesis, they quoted peak horsepower ratings for both premium and mid range fuels. Dropping from 91 to 89 gave something like a 7 HP loss (roughly 375 going down to 368 if memory serves me right; a little less than 2%. As a side- check out the Genesis coupe that will come to the US next year at Hyundai Genesis Coupe: Affordable Performance 300+hp Sport Coupe | Hyundai I saw a bunch of these when I visited Hyundai's development site last year. It's not a G- but its not a bad first shot....
I also ran a test last year for a few months where I swapped betweeen premium and regular and kept track of gas mileage for each. Premium gaved about 1-2% better mileage but at a price premium of >10%. The regular gave a little knock under some conditions but like I said before- the computer quickly compensated for it....
2005 6MT Coupe : Laser Red : Graphite : Premium : Aero Package
Also you have to think that the higher octane the fuel the hotter it burns, therefor lasts longer. You might not notice a huge difference, but you would prob be spending just as much in miles just because the fuel wont last as long.
SOLD "Pearl" My 04 6mt Fully Loaded Coupe! NOW I have a 2011 G37xS Coupe.... Time to Start Modding!
I don't know if the fuel grades are different in your area, but here we typically get 87, 89, and 93. Since Infiniti recommends 91, I could technically use half a tank of 89 and half a tank of 93. (Or 33% @ 87 + 66% @ 93).
The price differential between plus & premium, however, is only 10 cents/gallon, so that would only save me 5 cents/gallon, times 15 gallons/fillup = 75 cents times 26 tanks per year = $19.50 per year saved.
If the price differential between grades ever becomes greater, or if I find myself driving a LOT more, then it may become worth the extra effort. Until then, premium only.
A question for you guys. How would you know if you are really getting a premium gas on a premium pump? do you ever think of that? I mean just out of curiosity, we might think that were getting a premium gas(93) but instead were getting a regular. Im sure a lot of people had encountered this one.
so do u give a baby a plastic bag even tho it states not to, simply cuz u dont see a problem??....do u dry ur hair in the bathtub even tho it says not too but u dont see a problem ???....so Why the hell Put anything less than 91 octane in ur G ?!?...they made the car and the engine all u did was buy it....in otherwords they know more about the engine then u do and no the consequences of using non 91 octane....it doesnt say use 89 becuz gas is high right now....USE 91....if u cant afford the gas u cant afford the car !!
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2004 Coupe Auto
Tons' o stuff done....
Originally Posted by JESUS
04GcoupeAt is by far the best member of this forum
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