2018 G80 Sport Fuel type

tcoach00@hotmail.com

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Wondering what people are running for fuel in their g80 sports? 90 octane ethanol free or 93 octane with ethanol?
I am running 90 octane ethanol free because I don't want the ethanol gumming up the engine.
Thoughts?
 

bubbaG80Sport

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I am running Premium 92/93 ocatane (depending on gas station) with 10% Ethanol in my 2018 G80 Sport 3.3 twin turbo.
Ethanol will NOT "gum" up the engine. It actually burns cleaner than gasoline and reduces exhaust emissions.

Ethanol pro/cons versus 100% gas (ignoring the political and/or environmental points).
Pro:
P1) Fuel with ethanol is cheaper than pure gas. 100% gas averages +$0.50/gallon above 10% ethanol premium (92/93 octane) gas in my area.
P2) Adding Ethanol is a less expensive way to raise the octane level of fuel. I'll determine 100% gas octane level at my next gas station visit.

Con:
C1) Ethanol is less energy-dense than gasoline resulting in lower fuel economy/performance. Reported reduction in MPG is %3->4%.
C2) Modern cars (post 2001 year) are designed to run up to 10% ethanol. Older (pre 2001) cars had issues with the ethanol drying out and causing decay in older rubber hoses, seals, and diaphragms.
 

mgg

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It is winter here in WI and I am running regular 87 octane. So far I have not been able to tell any difference. Drove it for several weeks with out putting it in Sport mode. Now that I have discovered Sport mode even with regular gas it is a monster. When summer comes I will try a couple tanks of Premium to see if I can tell any difference in sport mode. The car has plenty of power for me.
 

dareckibmw

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buellwinkle

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bubbaG80Sport

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Snippets from pages F6->F7 of the 2018 G80 Owners manual...

3.3/3.8 engine
Your new vehicle is designed to use only unleaded fuel having an octane number ((R+M)/2) of 87 (Research Octane Number 91) or higher.(Do not use methanol blended fuels.)

5.0 engine
Your new vehicle is designed to use only unleaded fuel having an octane number ((R+M)/2) of 87 (Research Octane Number 91) or higher. For improved vehicle performance, premium unleaded fuel with an octane number ((R+M)/2) of 91 (Research Octane Number 96) or higher is recommended. (Do not use methanol blended fuels.)

To prevent damage to your vehicle’s engine and fuel system:
  • Never use gasohol which contains methanol.
  • Never use gasohol containing more than 15% ethanol.
  • Never use leaded fuel or leaded gasohol.
  • Never use "E85" fuel.
Your New Vehicle Limited Warranty does not cover damage to the fuel system or any performance problems caused by the use of "E85" fuel.
 

buellwinkle

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Fuddy

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Top Tier 87 is all I run in my Sport. Runs like a champ. Run the same stuff in my 5.3L pickup, have 197,000 miles on it with no complaints.
______________________________
 

buellwinkle

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Fuddy

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Thank you, I am not sure what Tip Tier 87 is but it sounds like I can go with Premium unleaded and be safe for now at least. Thank you, I know little about fuels these days... jp
Top Tier is gas that’s had detergents added. They list it on the pump, and the page MCC posted is good.

87 is the octane rating. No need for premium according to the manufacturer. If you don’t get Top Tier, you’ll want to run a good fuel additive every time you change oil. That’s what the dealer will do, too.
 

ctrcbob

Been here awhile...
A couple years ago, I purchased a small kit to test the percentage of ethanol in the gas. I was using 87 octane at various stations. Tested every fill up for a month. Never tested over 6% or less than 2%.
______________________________
 

EdP

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buellwinkle

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G-840003

A bigger concern is the corrosive effects of methanol. Of course, ethanol is also corrosive to aluminum components, gaskets and rubber hoses. But methanol is even more so. Both are safe to use in small amounts, but uncontrolled and unregulated mixing can result in concentrations high enough to cause additional wear and damage over time to sensitive gaskets and hoses in the fuel system.
 

buellwinkle

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bubbaG80Sport

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This weekend I visited a local convenience store (Pilot) to purchase 100% Gas (ethanol free) for my lawn mower. I captured cost/octane for all the fuel sold. Cost is in U.S. dollars.
$2.399 Regular 87 Octane 10% ethanol
$2.659 Mid Grade 89 Octane 10% ethanol
$2.799 Regular 87 Octane 0% ethanol (100% gas)
$2.899 Premium 92 Octane 10% ethanol
This gas station and most others state UPTO 10% ethanol. This gas station specifically states they are NOT Top Tier.

I am going to continue using Premium/92 with up to 10% ethanol "Top Tier" in my 2018 G80 3.3TT Sport. I'm favoring the higher octane because of the higher compression/turbo-charged 3.3TT engine. 100% gas would give better performance/fuel economy, but the lower octane may increase risk of knocking/pre-detonation on occasion. I do know modern vehicles compensate/prevent this, but I am more interested in life of engine versus getting the absolute best performance out of the engine.

Averaging 15K miles/year at 20MPG, spending +$375.00USD for Premium/92 is worth it to me for peace of mind. If I can find 92 or better octane in 100% gas ("Blue" 100LL AVGAS ;) ) I'll give it a try, but I think this is unlikely and if found I'd expect to be even more expensive then Premium/92 with ethanol.

IMO there is no downside to ethanol in modern cars other than having less energy density (performance/MPG). Ethanol is actually cleaner burning and emits lowers emissions. But, if I had the Hyundai/Genesis 3.8V6 or 5.0V8 normally aspirated engines, I'd run the Regular/87 with 0% ethanol.
 

mgg

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You have to do what you think is best. Im running regular 10% max ethanol. The car runs as smooth as can be and I get plenty performance especially in sport mode. I think it is more important to have a plan and stick to it. I noticed when switching from leaded to unleaded and back in my motorcycle it would take 70 to 100 miles for it to recalibrate to the different gas and it ran like sh*t during the recalibration.
 

buellwinkle

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EdP

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