10% Ethanol

[smurfs_of_war]

Simply for lack of options I fuelled up with the Husky 92 Octane 10% Ethanol blend. Wow! I couldn't believe it. The engine ran as smooth as silk, and I got substantially improved mileage- going by the gauge- a trip that normally takes almost a quarter tank was done in a little more than an eigth tank.

Correct me if I am wrong, but isn't this the exact opposite of what I should see with the higher ethanol content?

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[Sir John]

Simply for lack of options I fuelled up with the Husky 92 Octane 10% Ethanol blend. Wow! I couldn't believe it. The engine ran as smooth as silk, and I got substantially improved mileage- going by the gauge- a trip that normally takes almost a quarter tank was done in a little more than an eigth tank.

Correct me if I am wrong, but isn't this the exact opposite of what I should see with the higher ethanol content?

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From what i read and my personal experiences, yes this seems exact opposite. I run 91 octane 0% ethanol and when i switched to that over 15,000 miles ago i got better fuel economy. To be honest, I've been thinking about switching to 89 with 10% ethanol for a few tanks to see if any changes.

 

[Galion]

Simply put Ethanol has less energy than gas so yes, you will lose economy with it. The gains you saw could of come from having a tailwind, lighter foot on the go pedal or the higher octane playing nice with the engine tuning.

 

[Andy578]

non ethanol gas is pretty rare here these days but during a trip a few years back i filled the silverado with some and found it went about 200km further then with 10% ethanol

 

[hemihustlin]

What brand and octane do you normally purchase?

 

[smurfs_of_war]

89 typically

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[SlowRoller]

There are times when I question how 'fresh' the 'pure' gas is at some stations,,,

Here in Houston, there is no 'pure' gas, but the refinery is 'just down the road',,,

When traveling, some of the 'pure' gas stations I see area 'mom-pops' that do not look like they move a lot of fuel. Beyond the premium price they charge, I often wonder how old their gas is,,,

Hard to say, but in the case of the OP, I'd try a few more tanks and see what happens.

 

[QwikKota]

There are times when I question how 'fresh' the 'pure' gas is at some stations,,,

Here in Houston, there is no 'pure' gas, but the refinery is 'just down the road',,,

When traveling, some of the 'pure' gas stations I see area 'mom-pops' that do not look like they move a lot of fuel. Beyond the premium price they charge, I often wonder how old their gas is,,,

Hard to say, but in the case of the OP, I'd try a few more tanks and see what happens.

I hear ya. I was getting about 15mpg but this last tank is barely above 13. I always by Shell 87. When I worked at Kinder Morgan we just had tanks of gas, no tanks of 87/89/93 etc. I'm not sure how that works but some say the density and settling is how it's selected. I doubt it. Jefferson truck rack on 225 in Pasadena is where most of the trucks fill up before they deliver to the stations. From what I recall, they don't have selective fill spots for octane ratings.

 

[Canadian_Ram]

94 octane gas from Husky makes my truck run like a dream with HF tuning

 

[jag1886]

Yes you are right, higher octane and ethanol will not get you better gas milage. Ethanol has half the BTU's of gasoline which means it takes twice as much to achieve the same anything HP or gas milage. So that should mean the 10% ethanol should net 5% less milage.

 

[noupf]

Yes you are right, higher octane and ethanol will not get you better gas milage. Ethanol has half the BTU's of gasoline which means it takes twice as much to achieve the same anything HP or gas milage. So that should mean the 10% ethanol should net 5% less milage.

you are a bit misguided and misinformed here.....

A gallon of e10 produces 115k btu's.
A gallong of E85 ethanol produces about 77k btu's which equates to a difference of about 35%......not the 50% you are claiming.

More importantly, the e85 produces about 10-15% less energy than a gallon of e10 gasoline when used in an internal compustion engine. Even compared to a pure gallon of gasoline, the e85 would only produce about 17-20% less energy. The point, its not really a direct comparison ( btu's/energy to how many mpg's you get out of it in an engine )

I had a silverado that was flex fuel. When i ran e10 gas, i got about 350 miles out of a tank. When i ran e85, i got about 310 miles per tank. The difference was about 11%.......so each vehicle varies, but there is no 50% difference when talking about milage differences when comparing gas and ethanol.