Premium Gas in 2013 GDI V6?

[SoCalGen]

I ALWAYS use top tier gas. Usually it's either Shell (first choice), Chevron (second choice) or 76 (third choice). But I only put in the cheap stuff. Usually 87 octane. I've been reading various reports on here that the Genesis GDI really likes premium. Have you all really noticed a difference or is it snake oil?

I'm curious cause if I gain a mile or two per gallon it would probably help offset the cost difference. Which should only be a few dollars per tank anyway.

 

[Mark_888]

I have the pre-GDI Genesis V6 and I now use mid grade fuel. I find that the engine is slightly more responsive, and the engine seems a little quieter.

Actually, I normally fill with about 2/3 tank regular and 1/3 tank premium, since mid-grade is a bit overpriced by my calculations. I am sure there is a small MPG improvement also, but I have not calculated it. I use two different credit cards, since some stations will not let me use the same one twice.

 

[Ernie3647]

I have the pre-GDI Genesis V6 and I now use mid grade fuel. I find that the engine is slightly more responsive, and the engine seems a little quieter.

Actually, I normally fill with about 2/3 tank regular and 1/3 tank premium, since mid-grade is a bit overpriced by my calculations. I am sure there is a small MPG improvement also, but I have not calculated it. I use two different credit cards, since some stations will not let me use the same one twice.

After testing performance and mileage I’ve come to the same conclusion with my V-6 for the same reasons you state though mine is a GDI. I’ve tried premium and regular many times but only notice a difference between regular and mid grade. I stick to Exxon which is the only Top Tier gas available to me here. Oh my Sonata turbo it’s a different story. That car runs the best on premium gas even though regular is recommended and testing has verified that also.

 

[Mark_888]

After testing performance and mileage I’ve come to the same conclusion with my V-6 for the same reasons you state though mine is a GDI. I’ve tried premium and regular many times but only notice a difference between regular and mid grade. I stick to Exxon which is the only Top Tier gas available to me here. Oh my Sonata turbo it’s a different story. That car runs the best on premium gas even though regular is recommended and testing has verified that also.

Turbo's can get cause the engine to get really hot, so I can see how they could benefit from the cooler running premium gas.

 

[SoCalGen]

Well.... that settles it. Next fill up I'm going to try a few tanks of premium. Also going to put the flapper door back in because I think that's all a bunch of b.s. and has hurt my fuel economy.

 

[DRS]

See if you can find this type of gas.. Based on what you are seeking, max BTU and combustion for your uber high compression Adaptive (for different fuel) GDI, non ethanol premium give you some bang for the buck.. The price in the photo is high. Because way out in the boonies. In major locations would be less.. Not familiar with this brand normally. So far seems to work very well on the particular GDI (non Genny) I am using at the moment.

 

[DRS]

See if you can find this type of gas.. Based on what you are seeking, max BTU and combustion for your uber high compression Adaptive (for different fuel) GDI, non ethanol premium give you some bang for the buck.. The price in the photo is high. Because way out in the boonies. In major locations would be less.. Not familiar with this brand normally. So far seems to work very well on the particular GDI (non Genny) I am using at the moment.

Pic two did not attach.

 

[amartz]

Also going to put the flapper door back in because I think that's all a bunch of b.s. and has hurt my fuel economy.

I never completely removed the door, just used 4 layers of gorilla tape to lessen the magnet's grip so the door opens easier and sooner. And it made a marked difference for me, for anything that could be loosely described as a "rolling stop".

 

[SoCalGen]

I never completely removed the door, just used 4 layers of gorilla tape to lessen the magnet's grip so the door opens easier and sooner. And it made a marked difference for me, for anything that could be loosely described as a "rolling stop".

In my situations it's most noticeable getting off the freeway. Rolling to a stop at a red light, just before stopping completely the light changes to green. I punch it and the car does nothing for at least 2 seconds. The transmission in these cars is very very lazy to shift back down to first.

 

[SoCalGen]

Pic two did not attach.

So basically a no-ethanol 93 octane? That might be hard to find around Los Angeles. It seems every station here mentions something about ethanol.

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[amartz]

In my situations it's most noticeable getting off the freeway. Rolling to a stop at a red light, just before stopping completely the light changes to green. I punch it and the car does nothing for at least 2 seconds. The transmission in these cars is very very lazy to shift back down to first.

That's the situation. Sorry if I've had this discussion with you already, but it's my contention that it isn't the transmission that's lazy, it's the motor that's lazy (because of the air flapper), and once the motor isn't lazy, then the transmission isn't either.

 

[SoCalGen]

That's the situation. Sorry if I've had this discussion with you already, but it's my contention that it isn't the transmission that's lazy, it's the motor that's lazy (because of the air flapper), and once the motor isn't lazy, then the transmission isn't either.

Well, IF that's the case and the flapper door removal + K&N drop in filter has done little to nothing for me then I don't know what else to do except try the premium fuel. As far as I know nobody makes a good CAI for the Genesis and I've e-mailed at least 10 tuner companies over the last few weeks and nobody makes a single thing for the 3.8L sedan. It's sad because they all tell me I wouldn't gain much with a tune. I think they're all wrong. Those of us that own these cars KNOW that 333hp is NOT being unleashed when stomping the pedal from a dead stop. I'm sure a tune would awaken the beast inside.

 

[Mark_888]

So basically a no-ethanol 93 octane? That might be hard to find around Los Angeles. It seems every station here mentions something about ethanol.

No-ethanol can usually be found around marinas, since many boat engines cannot handle ethanol. But it is expensive.

 

[DRS]

So basically a no-ethanol 93 octane? That might be hard to find around Los Angeles. It seems every station here mentions something about ethanol.

You must try and see.. If you can find it. There is a app for ethanol free stations.. Helps locate about half the stations. Once you find one, add it to the list.

91 ethanol free works great. Better than Shell 93 where they have added ethanol. Smoother at idle, running, better mileage.

Of course, ethanol free gas that is stale, or not good quality would not help. I am sure there is some of that out there.

I have direct experience with benefit in 3.3 GDI Sedona picking up 10-15% mileage, and more gutsy with ethanol free premium. So. Not just the Genny motors.

 

[SoCalGen]

Interesting.

 

[blkgenRspec]

Better throttle response, smoother acceleration. My vehicle just performs better on premium. All of my vehicles do, I used reg when I first got her, she was very sluggish, kind of how your describing your car now. I then used fuel injection cleaner at an empty tank, used premium since. Also, there's a few companies that offer intakes for the 3.8sedan. CarId.com has a few, get some exhaust and I believe there is a tune available as well for the 3.8 sedan I read on this site a couple months ago. It's not a canned tune tho, so you would have to attend a tuning event. People who say you wont benefit much from a tune are just ill advised in my opinion. A tune is about much more than just hp n tq #'s. Its about air flo,fuel enrichment, power delivery, rpms shiftpoints, etc. etc. 30whp with a well tuned vehicle goes a long way! Ive owned both turbo n supercharger vehicle, boosted cars benefit more, but to say n/a only has minimum benefits is stupid..

 

[PMCErnie]

Money to burn? Why not give Shell's new V-Power Nitro a try? Meanwhile, I'll stick with Sam's Club regular gas and a bottle of Techron every so often.

http://www.shell.us/products-servic...gclid=CMzlyrGjzMYCFZMWHwoduyIOKQ&gclsrc=aw.ds

 

[SoCalGen]

Better throttle response, smoother acceleration. My vehicle just performs better on premium. All of my vehicles do, I used reg when I first got her, she was very sluggish, kind of how your describing your car now. I then used fuel injection cleaner at an empty tank, used premium since. Also, there's a few companies that offer intakes for the 3.8sedan. CarId.com has a few, get some exhaust and I believe there is a tune available as well for the 3.8 sedan I read on this site a couple months ago. It's not a canned tune tho, so you would have to attend a tuning event. People who say you wont benefit much from a tune are just ill advised in my opinion. A tune is about much more than just hp n tq #'s. Its about air flo,fuel enrichment, power delivery, rpms shiftpoints, etc. etc. 30whp with a well tuned vehicle goes a long way! Ive owned both turbo n supercharger vehicle, boosted cars benefit more, but to say n/a only has minimum benefits is stupid..

I don't actually see an intake system on that carid.com site for the 3.8 Sedan. I see a lot of adapters and filters but not any actual systems/tubes.

 

[SoCalGen]

I filled up the other day with 91 octane at Shell. That was the highest they had but I think it had ethanol in it.

 

[Bill K]

I'm not sure why people are putting premium in their V6's when Hyundai doesn't even recommend it. I could see it, if Hyundai said that Premium would get you 10 more H.P.
Premium isn't a "better" gas, it just resists detonation more than regular.
This reminds me of a friend of my wife's. When she told me that she always used Premium in her Buick, I asked her why. She said that her father told her to do this, when she was young, and it just stuck. He said something silly, that it was just a "better" gas.

Has there been any scientific studies that show that Premium isn't a waste of money in cars that don't require it????