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RegGuheert
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Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 2:11 pm

A few months after we purchased our LEAF, I realized that our other vehicles typically just sit around, so we started filling two of them with ethanol-free gasoline only. I felt that pure gasoline would be less corrosive to the rubber parts of the engine and it would also likely absorb less water. I typically find I can purchase the ethanol-free fuel for only 3 to 5% more than "regular" gasoline. I suspected this would result in better fuel economy, thus eliminating any additional cost.

At this point, I have to conclude that the new plan is working out well for us. I recently achieved a record-high highway efficiency with our 2003 HCH of 56.0 MPG. I do not think I have previously ever exceeded 52 MPG in the entire life of the car. While a big part of this achievement was likely due to the hypermiling that I did on the trip, I credit pure gasoline as part of the reason for the result. Note that this was achieved with a 500-foot elevation rise on a highway with a posted speed limit of mostly 70 MPH with rain pouring down for about 1/3 of the drive in an 11.5 YO hybrid with 91,000 miles and a BMS which was reprogrammed in 2011 to reduce the SOC range used by the car.

So I'm interested in hearing others' experiences with ethanol-free gasoline in your ICEs and hybrids. Do you use it? How much extra does it cost? Do you think you get better fuel mileage? If so, how much better?

Also, does anyone have any links to good data on the performance of ethanol-free gasoline versus "regular" gasoline?

Finally, if you are wondering where to purchase ethanol-free gasoline, here is a link to a site which can help you find one: pure-gas.org.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
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TomT
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Re: Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 2:28 pm

Ethanol free gasoline (or at least low ethanol - 5% or less) is better on almost every front. It is inherently more stable long-term, is less corrosive, and has higher specific energy output. It is what we use in our boat and is carried by our marina fuel dock. Aircraft gasoline (100LL) also has no ethanol but does have a very slight amount of lead..
Last edited by TomT on Tue Aug 13, 2013 6:11 pm, edited 2 times in total.
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LTLFTcomposite
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Re: Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 3:41 pm

Isn't a small amount (5%) required as an oxygenate in summer blend gas since MTBE was outlawed?
LTL
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ebill3
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Re: Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 4:36 pm

Thanks for the tip on where to purchase. I no longer use any gasoline, but I have passed the link along to friends. I didn't realize you could get ethanol free gasoline.
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Bicster
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Re: Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 5:36 pm

I've heard of this mythical Ethanol-free gas, but around here everything says "up to 10% ethanol" .. unless it's E85 (85% ethanol)

What do they replace the ethanol with? Is it the traditional MTBE gas blend or something different?
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keydiver
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Re: Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 8:25 pm

If I recall from a previous thread, from a purely "energy" standpoint E10 will give you a 3% hit in mpg. I see at least that much on my 2006 Prius, more like 5% IMO. Its probably different for newer cars that were calibrated to run on that crap.
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LTLFTcomposite
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Re: Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 8:43 pm

Bicster wrote:I've heard of this mythical Ethanol-free gas, but around here everything says "up to 10% ethanol" .. unless it's E85 (85% ethanol)

What do they replace the ethanol with? Is it the traditional MTBE gas blend or something different?
I think it's like aviation gas, you can accomplish the same thing without oxygenating agents by refining higher quality gasoline but it costs more.
LTL
White 2012 SV delivered 10 Dec 2011 returned 25 Nov 2014 replaced with stopgap ICE Sentra
[35 months] [35K miles] [9 Bars]
2013 Volt replaced after 36 months/30k miles with ICE Rogue
2016 SV-adjacent May 2016 lost 4th bar March 2018

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TomT
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Re: Thoughts on ethanol-free gasoline?

Tue Aug 13, 2013 9:06 pm

There is no way you can engineer around since Ethanol (alcohol) simply has lees energy than gasoline, per volume...
keydiver wrote:If I recall from a previous thread, from a purely "energy" standpoint E10 will give you a 3% hit in mpg. I see at least that much on my 2006 Prius, more like 5% IMO. Its probably different for newer cars that were calibrated to run on that crap.
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
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ebill3
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Re: Thoughts on ethanol-free gasoline?

Wed Aug 14, 2013 1:05 am

TomT wrote:There is no way you can engineer around since Ethanol (alcohol) simply has lees energy than gasoline, per volume...
keydiver wrote:If I recall from a previous thread, from a purely "energy" standpoint E10 will give you a 3% hit in mpg. I see at least that much on my 2006 Prius, more like 5% IMO. Its probably different for newer cars that were calibrated to run on that crap.
Exactly!

Boy, I really do not want to get into a big green discussion here, but that corn ethonal business is a great big loser, in MHO. Brazil and sugar cane? They have nailed it.
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lkkms2
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Re: Thoughts on ethanol-free gasoline?

Wed Aug 14, 2013 2:38 am

Last years drought had a big impact on the cost of ethanol, but this year oil companies are not going to like the competition. Ethanol prices coming way down.

http://e85prices.com/

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