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E85 ?

E85 ?

Postby Marco Magic [OP] » Jan 30 2012, 5:27am

Hello Everyone,

I'm new to the forum. I like the few topics that I have read so far. My question....
I finally have e85 locally to me. Is their any thing I need to know / do before I fill it? I have a 2011 Sierra Crew Cab 4x4 SLE. What is the mileage range I should expect to see?
Thanks for your answers & time.
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Related Topics  DO NOT USE E85   e85 milage   E85.... How many tanks can I run?   2014 5.3 HP rating on E85   E85 in 2012 gmc sierra 
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Re: E85 ?

Postby AzDragonLord » Jan 30 2012, 11:55am

Welcome! I use e85 almost exclusively, since it's American made, burns cleaner and is our country's best gasoline replacement.

You'll probably see about a 15-20% drop in MPG since e85 has less energy than gas. If your price spread is about 20% (most places aren't right now), then your cost-per-mile will be equal or better using e85.

Keep in mind...adding more than 3 gallons triggers a "fueling event" in the ECM, which then monitors the engine's knock sensor. This is how the engine knows if it's burning gasoline or ethanol...in any proportion. When switching between fuel types, drive at least 10 miles before shutting off the engine so it can learn the new fuel mixture and tune the engine, otherwise your performance and MPG could suffer dramatically.

Check out http://e85prices.com/ for current e85 pricing, locations and other good information!
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Re: E85 ?

Postby Silverado55 » Jan 30 2012, 12:43pm

Lucky you! there are only a handful of E85 filling stations in Canada...None which are close to me! I'd definitely be happy to use a more clean burning fuel even if it cost a little more to run! Does anyone know of any downfalls to running E85? what about using a Half and Half mixture?
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Re: E85 ?

Postby WingNut » Jan 30 2012, 1:52pm

The good news is that you have the FlexFuel engine that can burn that rot-gut crap called ethanol. The bad news: the Dept of Energy and the EPA studies show a 30%-40% decrease in milage. The bad news (2): Ethanlol is hydroscopic: meaning it attacts water over time. So if you plan on leaving your vehicle stored for a while, you'll need to drain the tank, add an additive, and/or fill it up with real gas (if you can find it).

More info on ethanol: http://www.businessweek.com/lifestyle/c ... 058678.htm
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Re: E85 ?

Postby patmc81 » Jan 30 2012, 2:10pm

Just did a test a few weeks ago, if you do any highway driving your mileage will suffer bad! Like 3 to 4 mpg. So its not worth running, but if you do a lot of city driving its not bad I only lost about 1 to 1.5 MPG
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Re: E85 ?

Postby Marco Magic [OP] » Jan 30 2012, 11:09pm

Thanks,

I think I'm going to wait for the warmer weather before I use it. I see in the manual that starting issues in freezing temps. I don't need that problem now.
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Re: E85 ?

Postby SilentWolf » Feb 03 2012, 7:09pm

I heard somewhere that the dealership needs to change something in the computer to go from gasoline to E85 or vice-versa... is that true? Or does the system "relearn" automatically?
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Re: E85 ?

Postby djom1cincy » Feb 03 2012, 9:44pm

I've ran both with no problems. I'm sure the computer learns what grade your running and adjust for it. The only thing I do is run the tank real low before switching. Does it make a difference? I don't know. I'm wondering what happens if you mixed half a tank of one with the other.
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Re: E85 ?

Postby Gator » Feb 03 2012, 10:18pm

you are not supposed to mix E85 with Regular type gas,at least on boats you can not mix E10 with 90 rec fuel (non ethonal) as it will create problems since boats are not used as much,if you plan to leave your truck idle for a few weeks,then don't use E85.

However if you look in your manual (2011 GMC) it says that by using E85 the 5.3 V8 gets 326 HP.

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Re: E85 ?

Postby AzDragonLord » Feb 03 2012, 11:56pm

If you have a flexfuel vehicle, you can run regular gasoline, e85, or any combination! The computer detects a "fueling event" and monitors the knock sensors and adjusts the engine until to match whatever fuel ratio you have in the tank. It takes about 10 miles of driving for it to learn the new mixture, so it's best to drive a while after switching fuel types.

...and the propaganda from the big oil companies is wrong...with straight e85 fuel there is nothing to reprogram and your MPG will drop about 18%, NOT 40%.
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