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post 1 of 32 Old 04-04-2009, 10:12 AM
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Default fuel type?

in lieu of the economy, has anyone downgraded to PLUS gas? I've been using premium for my 06 g35 coupe AT, and i was wondering what the difference might be if i start using PLUS instead of PREMIUM
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post 2 of 32 Old 04-04-2009, 10:17 AM
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wow...this again...


IMO not worth the few bucks a tank difference
even when regular was almost $4.00 a gallon (never hit $4 here) and premium was +20 I was running premium non-e10 for +30 more than that
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post 3 of 32 Old 04-04-2009, 10:24 AM
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never hit $4?! lol wow. i remember hitting over $5 at one point.
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post 4 of 32 Old 04-04-2009, 12:26 PM
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in lieu of the economy, has anyone downgraded to PLUS gas? I've been using premium for my 06 g35 coupe AT, and i was wondering what the difference might be if i start using PLUS instead of PREMIUM
well it causes engine to knock or ping, decreases fuel economy and HP ...thus defeating purpose of saving a few pennys.....as well as prbly an increase in maintenance

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post 5 of 32 Old 04-04-2009, 09:39 PM
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well it causes engine to knock or ping, decreases fuel economy and HP ...thus defeating purpose of saving a few pennys.....as well as prbly an increase in maintenance
the computer is supposed smart enough to prevent this from happening by jacking with the timing and such...this decreases the HP of the motor.

all to save a few bucks a tank
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post 6 of 32 Old 04-04-2009, 10:04 PM
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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.

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post 7 of 32 Old 04-04-2009, 10:05 PM
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Engine knock is a bad thing. Use premium.

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post 8 of 32 Old 04-05-2009, 11:13 AM
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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....

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post 9 of 32 Old 04-06-2009, 12:39 AM
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I suggest you see how much you actually save per year by switching down. It's a lot less than you might think.

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post 10 of 32 Old 04-06-2009, 01:02 AM
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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.

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post 11 of 32 Old 04-06-2009, 12:42 PM
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post 12 of 32 Old 04-06-2009, 12:57 PM
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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.
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post 13 of 32 Old 04-06-2009, 01:14 PM
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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.
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post 14 of 32 Old 04-06-2009, 01:42 PM
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don't fill up at mom-n-pop gas stations???
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post 15 of 32 Old 04-06-2009, 02:19 PM
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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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