What type of Gas do you use in your 2015

[greekgeek]

87 from Shell, occasionally a local brand ethanol free 91. This is in 5.0 and it runs just fine.

 

[jarred52]

I ran 3 tanks of premium top tier gasoline (mostly Shell) through my 3.8 Genny with no discernible difference in mileage. I had thought that with the higher compression ratio, the electronic timing advance would have give some noticeable difference but it did not.

Most important (in my opinion) is to use a top tier fuel and a regular dose of Techron additive to cut down on carbon build that all direct injection engines will accumulate. I add a bottle every month.

 

[Koolhaas]

I ran 3 tanks of premium top tier gasoline (mostly Shell) through my 3.8 Genny with no discernible difference in mileage. I had thought that with the higher compression ratio, the electronic timing advance would have give some noticeable difference but it did not.

Most important (in my opinion) is to use a top tier fuel and a regular dose of Techron additive to cut down on carbon build that all direct injection engines will accumulate. I add a bottle every month.

I'll try to find the document that came with my car, but it said not to use any additives. I think going to the top tier places (includes costco!) is mandatory for anyone who cares about their cars. The places that have Techron are def a plus.

 

[jarred52]

I'll try to find the document that came with my car, but it said not to use any additives. I think going to the top tier places (includes costco!) is mandatory for anyone who cares about their cars. The places that have Techron are def a plus.

The parts dept. at my Hyundai dealership has Hyundai branded containers of Techron additive. The service manager also told me that Hyundai recommends a dose of Techron at every oil change. I have a call into Chevron inquiring about any tests that they have done on the benefits of the use of Techron in direct injected engines. I am supposed to get a call back during the week of June 15. I will post any information that I receive.

 

[allagaroo]

Have 3.8. used BP premium first few tank fulls and then tried regular. No apparent difference in economy or performance.

 

[Koolhaas]

The parts dept. at my Hyundai dealership has Hyundai branded containers of Techron additive. The service manager also told me that Hyundai recommends a dose of Techron at every oil change. I have a call into Chevron inquiring about any tests that they have done on the benefits of the use of Techron in direct injected engines. I am supposed to get a call back during the week of June 15. I will post any information that I receive.

Sounds good!

I've never added anything to my tank. Never felt the need, but I think i would on a higher mileage car. I had a 130k Ford Ranger that i put crap-gas in and never had any issues. I had a 80k GTI that only wanted 91 or higher and it threw a CEL every time it got anything less, but ran great! (I did have software mapping on that car). Then I had a 30k VW CC that needed premium, and since then my other 3 cars have never gotten above 30k in miles.

I do have an X5 that the wife drives that we plan on keeping for a long time. Any help to keep the engine clean, I'll take it. Do you have a link for the techron that you buy?

 

[Alwaysforward]

I'll try to find the document that came with my car, but it said not to use any additives. I think going to the top tier places (includes costco!) is mandatory for anyone who cares about their cars. The places that have Techron are def a plus.

Here is what is in the manual. It also spells out at every Maintenance interval to "Add Fuel Additives". I presume that is for those who do not use Top Tier Gas.

 

[craigt]

If I read that correctly...

"...use good quality gasoline treated with detergent additives such as TOP TIER Detergent Gasoline". And then at the end "Do not mix other additives."

Does that infer that we should NOT be using additives if the gasoline already contains additives? I haven't used anything yet (about 11k so far). Just wondering if using additional additives to additives already in top tier gas is not recommended.

 

[Koolhaas]

If I read that correctly...

"...use good quality gasoline treated with detergent additives such as TOP TIER Detergent Gasoline". And then at the end "Do not mix other additives."

Does that infer that we should NOT be using additives if the gasoline already contains additives? I haven't used anything yet (about 11k so far). Just wondering if using additional additives to additives already in top tier gas is not recommended.

Yeah, that's the doc that i read! I read it as saying only add other additives if you aren't using TOP TEIR gas and your car isn't starting properly or it's not running smoothly.

 

[TroyK]

for those of you having your genesis serviced at the dealerhhip, is the service department automatically putting the fuel additive in during oil changes?? just wondering...

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[craigt]

If they are, they are not listing it on the receipt (nor charging me for it).

 

[PMCErnie]

Premium gas lovers can spend even more money now!

http://www.shell.us/products-services/shell-for-motorists/fuels/vpower-experience.html#iframe-Lw==

 

[NTX]

Did anyone notice in the Genesis press release that Hyundai makes a small comment about using regular fuel with the Lambda engine as well?

http://www.hyundainews.com/us/en/models/genesis/2015

In keeping with its 5.0-liter V8 sibling, the Genesis 3.8-liter Lambda engine utilizes direct-injection and produces 311 horsepower at 6,000 rpm and 293 lb.-ft. of torque at 5,000 rpm. It also has a high compression ratio of 11.5:1 for greater thermal efficiency. The Lambda engine will run on regular fuel with only a small reduction in peak power, and no negative driving effects, whenever desired by the owner.

I've been using 87 since I got my car. but their wording makes it seem like 311HP may now have been rated using 91 or higher... Previously, I thought it was only the V8 that needed premium to achieve all horses; now, not so sure.

If this "small reduction" results in the V8 going from 420 to 407 (-~3%) by switching to regular, I'm wondering if peak power for the V6 goes down to 302 (if rated using premium) or up to 320 (if properly rated to use regular) utilizing that roughly 3% baseline.

 

[brfatal]

for those of you having your genesis serviced at the dealerhhip, is the service department automatically putting the fuel additive in during oil changes?? just wondering...

No. Nobody does this.

 

[LandoAWD]

Previously, I thought it was only the V8 that needed premium to achieve all horses; now, not so sure.

The Coupes have the same disclaimers and make peak power with premium fuel. The ECU will adjust the knock threshold so old-folks can continue using the 87 water and save 3-5 bucks a tank.

 

[DRS]

The Coupes have the same disclaimers and make peak power with premium fuel. The ECU will adjust the knock threshold so old-folks can continue using the 87 water and save 3-5 bucks a tank.

➕1⃣ Quote of the day, the last sentence. You "age racist"...

And assuming a 7.5 percent decrease in mpg because not using top tier premium (because of the V6 and V8 detune for regular)... A 15 gallon fill, means an extra gallon lost for same miles driven using regular. Typical 30 cents difference a gallon for premium. $4.50 cost difference in a 15 gallon fill. With cost of fuel about $3 now for regular, seniors using regular save a net of $1.50. Which buys them a pop for the next trip to the MCL (MediCare Lounge) Cafeteria. If price of fuel goes back up to say $4.50, not any net savings. This formula works no matter what the mpg is for a 15 gallon tank fill. And many pure premium users have measured a 10 percent decrease using regular.

The 2012 V6 I rented for several months, prior to buying, has more power using premium. Using regular decreased its mileage by 11 percent.

The debate will never be totally settled.. Hyundai has considered its customers preferences and choices. And has programmed a motors that are designed to best be used with premium, to be used with regular.. Unlike some other brands. Kudo for Hyundai.

It has been reported that both Ford and Hyundai used premium (and the CPU had adjusted program assuming using premium all the time) in their EPA MPG tests.. Which were used for the public MPG rating. Because of the penny pinching youngsters, and MCL "their way or the highway" aged users used regular, they experienced decrease in mileage compared to what was published. This, combined with the rigged EPA MPG runs that can over estimate MPG, those motors that were designed for premium had a large decrease in the MPG ratings. This affected the Ford Ecoboost (which also allows the use of regular in a reduced MPG and power setting), and all Hyundai high compression (and turbo) GDI motors the most. Today, the MPG ratings are reported to be based on using 87 octane. Both Hyundai and Ford got in trouble about over rated mileage claims. Too bad the "lower" mileage they got in trouble for, many times, had more to do with using 87 octane 10-15% ethanol cheapo gas. Which is going to reduce MPG and performance in motors designed for peak performance and MPG with premium.

It is reported that Mazda uses regular for their MPG ratings in their sky active GDI high compression motors. That is why so many Mazda Sky active owners experience better than the average mileage when using top tier premium long term. As an example our Mazda 3 Sky Active will get well into the 42-44 MPG range on highway. Which is far above the EPA raring. And will average 33-36MPG in town. Which is also above the city rating. Mazda does not promote the use of premium. And power is rated using regular too. However, we experience not only better mileage, but better power using premium.. More off the line torque at lower RPM (where knocking and detonation can be heavy, where a massive detuning when using regular will happen), and better response when cruising in the uber low RPM overdrive gear steady state (again, can be a detonation and knocking magnet in this motor running range). This will also translate to better MPG when the CPU does not have to detune a high compression GDI optimized motor with premium.

 

[LandoAWD]

Stop doing the math and let me have my laughs.
Agreed on all counts, however.

 

[G-834374]

is the 3.8 a GDI? What kind of gas do you use?

Been using 87 octane with a bottle of Lucas every 3d fill up in my 2014 3.8 Since it was new. 116,867 miles with no issues.

 

[G80-2015-CaspianBlack]

I use Chevron 87 now. I'm the 2nd owner and when I first purchased I ran about 5 tanks of 91 before switching to 87. I prefer to use gasoline that does not contain any percentage of ethanol, so Chevron it is.

 

[EdP]

I use Chevron 87 now. I'm the 2nd owner and when I first purchased I ran about 5 tanks of 91 before switching to 87. I prefer to use gasoline that does not contain any percentage of ethanol, so Chevron it is.

It will run fine with ethanol too. I put 60k on my 2015 and so far 40k on my 2018. I prefer top tier gas, mostly Shell because I get 5 cents off if there is a station convenient.