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#3047914 - 06/28/13 01:33 AM Pure Gas vs. 10% E
markum Offline


Registered: 02/02/09
Posts: 52
Loc: seattle,wa
If this is a stupid question, I apologize in advance.

Is pure gas better than a top tier 10% fuel? I used to always fill with Chevron. I found a station called Cenex that sells pure gas in 93. I just never heard of Cenex. Pros and cons?? What are your thoughts on what I should be using?
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#3047938 - 06/28/13 03:50 AM Re: Pure Gas vs. 10% E [Re: markum]
BovineScapegoat Offline


Registered: 11/06/09
Posts: 235
Loc: Southern Ontario
In my area only regular 87 is 10% E. midgrade 5% and premium is always 0% Ethanol
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#3047955 - 06/28/13 05:33 AM Re: Pure Gas vs. 10% E [Re: markum]
229 Offline


Registered: 06/23/11
Posts: 714
Loc: Mid Atlantic
Pure gas and a bottle of Techron is the best.
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#3047974 - 06/28/13 06:10 AM Re: Pure Gas vs. 10% E [Re: markum]
PhillyJoe Offline


Registered: 03/19/09
Posts: 511
Loc: PA
Would you be mad if the bartender added 10% water to your 12 year old scotch?
Your car feels the same way.

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#3047996 - 06/28/13 06:52 AM Re: Pure Gas vs. 10% E [Re: BovineScapegoat]
Danno Offline


Registered: 10/07/12
Posts: 719
Loc: Northern Ontario, Canada
Originally Posted By: BovineScapegoat
In my area only regular 87 is 10% E. midgrade 5% and premium is always 0% Ethanol


Not likely.
The only gas that is advertised to be ethanol free in Ontario is Shell V Power premium 91 octane.

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#3048005 - 06/28/13 07:00 AM Re: Pure Gas vs. 10% E [Re: markum]
Tzu Offline


Registered: 10/12/12
Posts: 225
Loc: near Buffalo, NY
If find my 5.3l Silverado hardly pings at all on pure gas, and it seems finicky on what you put in it (especially in heat). My Camry beater gives me about 3mpg better on pure gas too. But the problem for me is that it costs more than super unleaded by nearly 10 cents per gallon. So economically I just run pure gas every other tank in my truck during the hot summer months. The Camry really doesn't care on way or another.
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#3048008 - 06/28/13 07:06 AM Re: Pure Gas vs. 10% E [Re: PhillyJoe]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 14243
Loc: Sunny Florida
Originally Posted By: PhillyJoe
Would you be mad if the bartender added 10% water to your 12 year old scotch?
Your car feels the same way.


I sure hope my fuel is not 12 years old! But I am in complete agreement.

Our fleet trucks take a big hit on 10% corn liquor, my car actually likes it for KR values but still costs me more as the mileage goes down with it.

Ever see the carb jet sizes in an alcohol fueled car at the strip? Some of the fuel pumps are like a commercial well on a farm! Takes a lot of liquor to make it work.

let's burn all our food as fuel and save the world...
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#3048016 - 06/28/13 07:10 AM Re: Pure Gas vs. 10% E [Re: Danno]
Rolla07 Offline


Registered: 11/05/11
Posts: 1612
Loc: MTL, CANADA
Originally Posted By: Danno
Originally Posted By: BovineScapegoat
In my area only regular 87 is 10% E. midgrade 5% and premium is always 0% Ethanol


Not likely.
The only gas that is advertised to be ethanol free in Ontario is Shell V Power premium 91 octane.


I know that in Canada both Shell and Ultramar does the 10%, 5% and ethanol free thing with premium. Petro can and Esso say up to 10% ethanol/dont specify. I dont like the idea of ethanol but doubt it makes a difference in mileage on a tank at an up to 10% ratio.
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#3048063 - 06/28/13 07:55 AM Re: Pure Gas vs. 10% E [Re: markum]
SrDriver Offline


Registered: 12/09/06
Posts: 2403
Loc: Southeast Alabama
I use whatever octane that the owners manual recommends. There are a couple of stations that in town that sell 100% gasoline but at a premium cost.

As far as mileage goes paying the extra price is simply not worth it in my opinion.

Keeping vehicle in tune. Keeping tires properly inflated. Adjusting driving some will = fuel savings.

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#3048082 - 06/28/13 08:25 AM Re: Pure Gas vs. 10% E [Re: markum]
Cujet Offline


Registered: 02/15/03
Posts: 4016
Loc: Jupiter, Florida
Remember that "if" the gas actually contains 10% ethanol (my local gas contains somewhat less by my tests 4% to 7% lately) , the gas has 3% less energy content. This means that MPG will be reduced by about 3%. If you get 33MPG, you can expect to lose about 1 mile per gallon at 10% ethanol.

However, locally the gas is well less than 10% ethanol, and MPG loss is very minimal. On the order of 0.5MPG.

We have local 100% gas (90 octane) station and I can't measure any MPG improvement while using the ethanol free gas.

That's all well and good. But here is what's interesting to me. The 100% gas has been having problems with water separating out! Causing rough running and occasional fuel starvation in my equipment. Yes, we had a lot of rain lately. And I suspect the station got a touch of water in the tank.

No problems with normal pump fuels. And, when I switched back to fuel with ethanol, the water was absorbed and problems went away.
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#3048089 - 06/28/13 08:36 AM Re: Pure Gas vs. 10% E [Re: markum]
A_Harman Offline


Registered: 10/01/10
Posts: 3979
Loc: Michigan
It's not an issue of octane. It's an issue of energy content.
Ethanol has an energy content of 26.8 MJ/kg.
Gasoline has an energy content of 43 MJ/kg.
So if you put ethanol in gasoline, the mixture will contain less energy than pure gasoline.
In the case of E10, the energy content would be 41.4 MJ/kg, or about 4% less than pure gasoline. Maybe you wouldn't notice a difference in fuel economy with this relatively small decrease in energy. But in a car that gets 25 mpg on pure gasoline, you would get 24 mpg on E10.
In the case of E85, the energy content would be 29.2 MJ/kg, or about 32% less than gasoline. You would definitely notice a decrease in fuel economy with this mix. This is why I say people shouldn't pay more than 70% of the price of gas to buy E85. In all years that E85 has been out, I've never seen it priced that low.
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#3048126 - 06/28/13 09:23 AM Re: Pure Gas vs. 10% E [Re: markum]
FZ1 Offline


Registered: 02/07/08
Posts: 4192
Loc: Texas
10-15% loss of mpg when got E10,down here.

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#3048128 - 06/28/13 09:26 AM Re: Pure Gas vs. 10% E [Re: markum]
dparm Offline


Registered: 04/19/10
Posts: 12335
Loc: Chicago, IL
Modern cars are tuned to run on gas containing up to 10% ethanol, FYI.
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#3048168 - 06/28/13 10:11 AM Re: Pure Gas vs. 10% E [Re: SteveSRT8]
HerrStig Offline


Registered: 08/24/11
Posts: 2929
Loc: Boston, MA
Originally Posted By: SteveSRT8
Originally Posted By: PhillyJoe
Would you be mad if the bartender added 10% water to your 12 year old scotch?
Your car feels the same way.


I sure hope my fuel is not 12 years old! But I am in complete agreement.

Our fleet trucks take a big hit on 10% corn liquor, my car actually likes it for KR values but still costs me more as the mileage goes down with it.

Ever see the carb jet sizes in an alcohol fueled car at the strip? Some of the fuel pumps are like a commercial well on a farm! Takes a lot of liquor to make it work.

let's burn all our food as fuel and save the world...

+1 And it will be a hungry world we save, but the "green weenies" want fewer people anyway.

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#3048169 - 06/28/13 10:12 AM Re: Pure Gas vs. 10% E [Re: dparm]
HerrStig Offline


Registered: 08/24/11
Posts: 2929
Loc: Boston, MA
Originally Posted By: dparm
Modern cars are tuned to run on gas containing up to 10% ethanol, FYI.
What's a "modern" car?

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