Fuel Type

stockli81 · 04-19-2022, 05:32 PM

Found station near me that sells Sunoco 91 / 93 / 100 Octane Ethanol-Free... A bit pricier... Given CR is 10.5.1, what Octane level are folks running on their M50i's? I just switched to 93 Octane Ethanol Free, wondering if it would be beneficial mixing 100 in.

Kool Kat · 04-19-2022, 07:52 PM

I do 93...

GerryC · 05-01-2022, 06:16 PM

100 won't perform any better than 93 in a stock engine. Spending money on higher octane than recommended is just wasting money. 93 ethanol-free is good stuff.

Gerry

JimVR4 · 05-03-2022, 05:49 PM

91 is more than sufficient. That's all we get in California 🤣

GREENPUS · 05-03-2022, 08:37 PM

Top Tier 93. I can't get 91 close to me and 93 is actually cheaper for me

Higgs Boson · 05-03-2022, 10:37 PM

you dont need ethanol free unless youre storing it in your weedwacker for the winter.

ethanol is oxygenated and makes more power than ethanol free gasoline and has more knock resistance.

jad03060 · 05-24-2022, 12:11 AM

Per volume, while ethanol has a higher anti-knock value, it has less energy, so in theory, for the same octane level with or without ethanol, the ethanol-free stuff should give you better mileage. Ethanol allows the company to use a lower octane refined product since the ethanol raises it to the desired value at the cost of less energy per volume.

stockli81 · 06-28-2022, 08:33 PM

probably a month out on ethanol free 93.... Definate MPG improvement... Will try out a 75/25 mix of ethanol free / ethanol.

chefwong · 07-01-2022, 12:39 PM

Does anyone still remember non corn gas.....I used to drive a state over for fillip as I did notice a difference with MTBE....those days re loooong gone

nZtiZia · 07-01-2022, 12:42 PM

no ethanol-free fuel in my area. i put fuel stabilizer in my 45e

LogicalApex · 07-02-2022, 04:45 PM

Quote:

Originally Posted by nZtiZia

no ethanol-free fuel in my area. i put fuel stabilizer in my 45e

Why do you add fuel stabilizer in the 45e?

The pressurized fuel tank will keep gas fresh for extended periods without use.

nZtiZia · 07-02-2022, 07:15 PM

Quote:

Originally Posted by LogicalApex

Why do you add fuel stabilizer in the 45e?

The pressurized fuel tank will keep gas fresh for extended periods without use.

even in sealed, pressurized tanks, the fuel can still degrade. it could help, but won't hurt

jad03060 · 07-26-2022, 06:33 PM

Per volume, ethanol has about 10% less energy in it, but produces a higher octane. So, ethanol free gasoline SHOULD give better mileage.

04-19-2022, 05:32 PM	#1
stockli81 Private First Class 54 Rep 173 Posts Drives: 2021 X5 M50i Join Date: Jan 2021 Location: N/A iTrader: (0)	Fuel Type Found station near me that sells Sunoco 91 / 93 / 100 Octane Ethanol-Free... A bit pricier... Given CR is 10.5.1, what Octane level are folks running on their M50i's? I just switched to 93 Octane Ethanol Free, wondering if it would be beneficial mixing 100 in.
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04-19-2022, 07:52 PM	#2
Kool Kat Enlisted Member 47 Rep 42 Posts Drives: 2022 BMW X6 M50i Join Date: Aug 2021 Location: San Antonio, TX iTrader: (0) Garage List 2022 X6 M50i [9.50]	I do 93...
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05-01-2022, 06:16 PM	#3
GerryC Captain 1610 Rep 847 Posts Drives: BMW Z4 M40i, BMW X5x40i Join Date: Jul 2021 Location: Florida iTrader: (0) Garage List 2022 BMW X5 xDrive40i [10.00] 2023 BMW Z4 M40i [9.72]	100 won't perform any better than 93 in a stock engine. Spending money on higher octane than recommended is just wasting money. 93 ethanol-free is good stuff. Gerry __________________ 2023 Z4 ///M40i Thundernight Metallic/Cognac Vernasca/Moonlight/Shadowline/19" Black 799M/PP/DAP/ACC/HK 2022 X5 xDrive40i Phytonic Blue/Cognac Vernasca/DAPP/LSP/PP/CCP/PAP/20" Style 738/Spare Tire/Trailer Hitch
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05-03-2022, 05:49 PM	#4
JimVR4 Captain 338 Rep 842 Posts Drives: 21 X5 M50i M-Sport Join Date: Nov 2011 Location: San Jose, CA iTrader: (0)	91 is more than sufficient. That's all we get in California 🤣 __________________ 2021 G05 X5 ///M50i / Phytonic Blue / Cognac Vernasca iStep 03/2023.50
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05-03-2022, 08:37 PM	#5
GREENPUS Second Lieutenant 133 Rep 264 Posts Drives: 2019 BMW M5C Join Date: Mar 2021 Location: St. Louis, Missouri iTrader: (0)	Top Tier 93. I can't get 91 close to me and 93 is actually cheaper for me __________________ 2019 M5 Competition 2021 X6 xDrive40i M Sport 2018 Toyota RAV4 AWD 2008 Corolla S Souped Up - The Black Widow
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05-03-2022, 10:37 PM	#6
Higgs Boson In the Details 1810 Rep 866 Posts Drives: Yes Join Date: Jan 2020 Location: Texas Hill Country iTrader: (0) Garage List 2020 AMG GTR [0.00] 2022 R8 Quattro Spyder [0.00] 2023 X5M50 [0.00] 2023 718 Spyder [0.00] 2024 Silverado [0.00] 2024 Civic Type R [0.00]	you dont need ethanol free unless youre storing it in your weedwacker for the winter. ethanol is oxygenated and makes more power than ethanol free gasoline and has more knock resistance.
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05-24-2022, 12:11 AM	#7
jad03060 Major General 3159 Rep 6,797 Posts Drives: X5 45e Join Date: Aug 2018 Location: NH iTrader: (0)	Per volume, while ethanol has a higher anti-knock value, it has less energy, so in theory, for the same octane level with or without ethanol, the ethanol-free stuff should give you better mileage. Ethanol allows the company to use a lower octane refined product since the ethanol raises it to the desired value at the cost of less energy per volume.
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06-28-2022, 08:33 PM	#8
stockli81 Private First Class 54 Rep 173 Posts Drives: 2021 X5 M50i Join Date: Jan 2021 Location: N/A iTrader: (0)	probably a month out on ethanol free 93.... Definate MPG improvement... Will try out a 75/25 mix of ethanol free / ethanol.
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07-01-2022, 12:39 PM	#9
chefwong Captain 351 Rep 997 Posts Drives: X5 Join Date: Sep 2007 Location: NYC iTrader: (0)	Does anyone still remember non corn gas.....I used to drive a state over for fillip as I did notice a difference with MTBE....those days re loooong gone
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07-01-2022, 12:42 PM	#10
nZtiZia Major General 4648 Rep 8,688 Posts Drives: eVeRyOnE mAD! Join Date: Dec 2020 Location: neither here nor there... iTrader: (0) Garage List 2021 BMW X5 xDrive 45e [9.88]	no ethanol-free fuel in my area. i put fuel stabilizer in my 45e
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07-26-2022, 06:33 PM	#13
jad03060 Major General 3159 Rep 6,797 Posts Drives: X5 45e Join Date: Aug 2018 Location: NH iTrader: (0)	Per volume, ethanol has about 10% less energy in it, but produces a higher octane. So, ethanol free gasoline SHOULD give better mileage.
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