Fuel Grade

[Monolith2001]

Always 91-93 in the Genesis.

 

[Alwaysforward]

I am waiting impatiently for your anal test results and I am not talking about your colonoscopy results. I suggest you go for at least 3 tanks of regular to really get the big true picture. I am pretty sure the difference will be negligible and you will run Regular after doing this. There is no way the increased fuel economy (if any, I predict unmeasurable) will outweigh the higher costs of Premium. Wanna start taking bets?

How did you know it was that time of the year No bets here. I am not doing this test to save a buck. I am only do this test to see the effects of the fuel mileage from the two levels of Octane. Call it curiosity testing only.

I will continue to use Super Unleaded after my one tank test of Regular as I think this will aid in keeping the soot from the tail pipes. I have yet to see any deposits on them yet and I have been only burning Mobil gas and the motor still has factory installed oil. I check them every time I wash the car and so far, so good (knock on dash ).

 

[pusaterkm]

Does using premium fuel somewhat offset the effect of E10 on a Genesis?

That's a good question. There are two states; Missouri and Montana that have exemptions for ethanol free premium. But for the rest of us we just have to deal with the ethanol in the fuels. My mildly educated guess (key word here being guess) is that running premium may help to offset the potential energy loss of the ethanol, but won't reduce the damage that ethanol can cause to components. When I said that it isn’t as big a deal for Genny it was because it is my understanding that newer cars are warded against the damaging effects of ethanol. But some automotive authorities still recommend additives to combat this. The gain with premium is of course the higher octane that allows the cars computer to advance the timing and adjust other settings to produce the most HP and some brands advertise better detergents in premium. Now in the case of my 1972 442, the effects of ethanol can be drastic. Because of the compression ratio, the need for some lead and a big thirsty 4bbl carb on it I mix a 114 octane leaded racing fuel with premium pump gas, usually in a 50/50 ratio. I’ve recently had to rebuild the carb due to gasket deterioration. My local muscle car guru was adamant about me using an additive to protect against ethanol. So bottom line, better safe than sorry. A long winded response for sure, but I like to talk about cars.

 

[Midnightsun]

I filled up this morning at a Shell station (I'm in Canada) First time I noticed this and i think this is exclusive to the way Shell does it's thing up here but it said Regular may contain up to 10% ethanol, Midgrade may contain up to 5% ethanol, Premium contains no ethanol.

You will get better milage with no ethanol and that's a fact Jack. Talk about marketing scheme!

 

[pusaterkm]

I filled up this morning at a Shell station (I'm in Canada) First time I noticed this and i think this is exclusive to the way Shell does it's thing up here but it said Regular may contain up to 10% ethanol, Midgrade may contain up to 5% ethanol, Premium contains no ethanol.

You will get better milage with no ethanol and that's a fact Jack. Talk about marketing scheme!

Shell is my preference here in the US as well. There aren't ethanol ratings on the premium fuel here which lead me to belive that the premium is ethanol free. I was so curious that I contacted Shell, but they could not provide a definitive answer and all I got was "it may or may not".

 

[Mark_888]

I filled up this morning at a Shell station (I'm in Canada) First time I noticed this and i think this is exclusive to the way Shell does it's thing up here but it said Regular may contain up to 10% ethanol, Midgrade may contain up to 5% ethanol, Premium contains no ethanol.

You will get better milage with no ethanol and that's a fact Jack. Talk about marketing scheme!

Canada is a huge oil exporting nation, and probably does not subsidize corn for ethanol production, so there are not the same economic and regulatory issues as exist in the US.

In the US, in most metropolitan areas, the EPA mandates ethanol in all grades of gas (including premium), except that there are some stations near marinas that have zero ethanol for boat engines. In rural areas, the requirement for ethanol may be relaxed in some areas.

 

[Mark_888]

Shell is my preference here in the US as well. There aren't ethanol ratings on the premium fuel here which lead me to belive that the premium is ethanol free. I was so curious that I contacted Shell, but they could not provide a definitive answer and all I got was "it may or may not".

In most metropolitan areas, Shell (and all others) are required to use ethanol. If you live in a rural area, then it may not have any, or may have less. It's an EPA thing.

 

[ntx_v8]

It's interesting that the owners manual calls out 87 or up octane for both engines, but adds for the 5.0 engine (only) that for improved performance, 91 octane is recommended. (page F7).

 

[EXBMWGUY]

That's a good question. There are two states; Missouri and Montana that have exemptions for ethanol free premium. But for the rest of us we just have to deal with the ethanol in the fuels.

I frequently travel to Wisconsin and see ethanol-free premium available at BP, Shell, Kwik Trip and others.

 

[ntx_v8]

In most of Oklahoma, about 2/3 of the stations have 10% ethanol pumps and straight gasoline pumps for regular. Typically, premium is one or the other.

______________________________

Help support this site so it can continue supporting you!

 

[Midnightsun]

Do I understand correctly that in the US you can choose from Premium, Mid Grade, Regular or Orville Redenbacher.

 

[Aquineas]

Do I understand correctly that in the US you can choose from Premium, Mid Grade, Regular or Orville Redenbacher.

I don't know that this is necessarily true in Texas; I haven't seen stations here that offer that, but Texas is pretty big, so...

 

[Mark_888]

Do I understand correctly that in the US you can choose from Premium, Mid Grade, Regular or Orville Redenbacher.

Yes, usually Premium, Mid Grade, Regular are offered in most places. But not all stations have mid-grade. For example, Costco only sells regular and premium.

Orville Redenbacher is offered inside the Costco store (not at pumps).

 

[thompithak3182]

i been driving the genny for 10 months now. with ethanol or without. mixed driving hwy and city. premium or regular. i get about the same mpg. average 22-24. also tried with top tier gas stations and regular gas stations such as kangaroo. I dont really think it makes a big difference either way and plus on the 3.8 the manual says regular and every oil change use additive if not present in the fuel u use regularly. from what i have heard using premium u can get a few hp but not a noticable difference. thats my 2 cents in on the fuel grade.

 

[GRIFF]

My opinion is that ethanol is an alcohol based product which absorbs moisture. The longer it has been setting, the larger the moisture content.

I always run ethanol free gas in all of my engines for this reason.

Griff

 

[zielritter]

The cycle of similar topic posts starts again with each new model and set of buyers.

Run top tier fuel preferably. Run premium if you want the most detergents and a spurt of extra power that you won't perceive. Your engine won't be damaged running regular fuel though - knock sensors retard timing to mitigate detonation.

Several of us run Chevron Techron additive through the fuel periodically to clean things up a bit. Injector cleaners in this vehicle will keep your injectors clean - it will have no impact on the valves as the fuel is sprayed directly into the combustion chamber with GDI.

Sucking Seafoam in through a vacuum hose has shown little hope in the way of keeping valves clean in GDI systems that are flawed and allow excessive carbon build up on the valves. Time will tell if this is a big issue for Hyundai's GDI engines, but at least one guy on this forum has taken apart his 5.0 to show us first hand that there is build up on the valves - a walnut blasting is the only way to get the baked on gunk off your valves.