2011 ecoboost 27 mpg hwy proof
05-13-2015, 10:21 AM
#11
I have to respectfully disagree. Higher octane fuels have a lower burn rate and are designed for higher compression engines. Read the information in the below links.
https://mn.gov/commerce/weights-and-measures/images/OctaneFacts.pdf
http://forum.ih8mud.com/threads/high-octane-fuel-vs-low-octane-fuel-facts-and-myths.160442/
05-13-2015, 10:53 AM
#12
Senior Member
^ I agree. Higher octane fuel burns slower and is designed for engines with higher compression. That's why the EcoBoost and forced induction engines make more power and are more responsive with those fuels.
05-13-2015, 11:26 AM
#13
Senior Member
Thread Starter
I'm sure its fairly technical the reasoning. Its all a matter of Air-to-Fuel, compression, and ignition timing. And its likely a little more complex with Turbo Charging. But I'm fairly certain the EB Engine advances and retards timing based on a knock-type sensor. Which means it can measure small changes in octane or burn rates of the fuel and change timing accordingly to keep our engines from doing themselves harm.
Advancing timing seems to get more power out of engines on all those Gear Head shows during a Dyno HP run....
That's my take on it. I'm an Engineer but I dont build engines... So take that as anecdotal...
Advancing timing seems to get more power out of engines on all those Gear Head shows during a Dyno HP run....
That's my take on it. I'm an Engineer but I dont build engines... So take that as anecdotal...
05-13-2015, 12:08 PM
#15
Senior Member
I don't see this being out of the realm of possibilities, at least for a short while on a long road trip with near perfect conditions as you seemed to have such as cooler temps, flat roads, little wind and a constant lower speed.
I myself just took a trip to my hunt camp last weekend, I filled the truck up on they way because fuel is cheaper about an hour north of where I live, re-set the fuel mileage and hit the highway. Like you I had cooler temps, mostly flat roads and kept it to 100km/h. I got 10.1 L/100km (23.26 mpg) out of my 4wd 5.0 with 3.55 gears, pretty much all the way to the hunt camp road. The way home I had some wind, I increased my avg speed by about 10 km/h and the truck returned to its normal 12L/100km (19mpg) which is usually what I see.
Drive them nicely and in good outside conditions, keep the stock stance and tire size and they will return decent mileage for what they are.
I myself just took a trip to my hunt camp last weekend, I filled the truck up on they way because fuel is cheaper about an hour north of where I live, re-set the fuel mileage and hit the highway. Like you I had cooler temps, mostly flat roads and kept it to 100km/h. I got 10.1 L/100km (23.26 mpg) out of my 4wd 5.0 with 3.55 gears, pretty much all the way to the hunt camp road. The way home I had some wind, I increased my avg speed by about 10 km/h and the truck returned to its normal 12L/100km (19mpg) which is usually what I see.
Drive them nicely and in good outside conditions, keep the stock stance and tire size and they will return decent mileage for what they are.
This is right on par with my 2011 5.0L, i'm averaging 13L/100km daily to and from work, a recent trip on the highway heading to southern Ontario, I got 11L/100 on the way there and 12/100 on the way home.
funny thing is, my boss just bought a 2014 ecoboost the same week I got my 2011 we travel the same stretch of road, same speeds and we are getting the same fuel economy.... so much for the added economy of the eco in this case.
05-13-2015, 12:39 PM
#16
Senior Member
Octane is not about "speed of burning" or "slower buring" it is about "igniting". It takes more to ignite a higher octane fuel or put another way...harder to ignite. The extra "power" comes from ignition advance/running more boost/raising compression/etc.
As opposed to diesel fuel where you want a higher Cetane Rating (which makes it easier to ignite) since it is all down by compression and not spark.
As opposed to diesel fuel where you want a higher Cetane Rating (which makes it easier to ignite) since it is all down by compression and not spark.
Last edited by DieselDawg; 05-13-2015 at 12:48 PM.
05-13-2015, 01:19 PM
#17
Senior Member
You can believe what you want. Pre-Ignition can and will hurt an engine. The reason his truck feels like a dog when he runs 87 is because the computer detects detonation and pulls timing and maybe even boost. His truck will make the most power on e85 because it has a slower burn rate and will resist detonation better than 93oct. Look in the manual of a eco-boost. I bet it recommends premium fuel. Boost increases cylinder pressure.
If you really want to technical. 5psi from one turbo to another one that is more efficient is not the same amount of air. The more efficient one is pushing more air at the same 5psi and will make more power.
I don't want to sound like an ***. Just trying to pass on information.
If you really want to technical. 5psi from one turbo to another one that is more efficient is not the same amount of air. The more efficient one is pushing more air at the same 5psi and will make more power.
I don't want to sound like an ***. Just trying to pass on information.
Last edited by jay_g; 05-13-2015 at 01:34 PM.
05-13-2015, 01:52 PM
#18
Senior Member
Thread Starter
You can believe what you want. Pre-Ignition can and will hurt an engine. The reason his truck feels like a dog when he runs 87 is because the computer detects detonation and pulls timing and maybe even boost. His truck will make the most power on e85 because it has a slower burn rate and will resist detonation better than 93oct. Look in the manual of a eco-boost. I bet it recommends premium fuel. Boost increases cylinder pressure.
If you really want to technical. 5psi from one turbo to another one that is more efficient is not the same amount of air. The more efficient one is pushing more air at the same 5psi and will make more power.
I don't want to sound like an ***. Just trying to pass on information.
If you really want to technical. 5psi from one turbo to another one that is more efficient is not the same amount of air. The more efficient one is pushing more air at the same 5psi and will make more power.
I don't want to sound like an ***. Just trying to pass on information.
I have read the manual. It recommends the use of 87 octane min and to use 91 or higher under heavy loads or towing. It does not recommend Premium fuel on either of my EcoBoost engines (3.5 nor 2.0 - Escape).
05-13-2015, 07:48 PM
#19
You can believe what you want. Pre-Ignition can and will hurt an engine. The reason his truck feels like a dog when he runs 87 is because the computer detects detonation and pulls timing and maybe even boost. His truck will make the most power on e85 because it has a slower burn rate and will resist detonation better than 93oct. Look in the manual of a eco-boost. I bet it recommends premium fuel. Boost increases cylinder pressure.
If you really want to technical. 5psi from one turbo to another one that is more efficient is not the same amount of air. The more efficient one is pushing more air at the same 5psi and will make more power.
I don't want to sound like an ***. Just trying to pass on information.
If you really want to technical. 5psi from one turbo to another one that is more efficient is not the same amount of air. The more efficient one is pushing more air at the same 5psi and will make more power.
I don't want to sound like an ***. Just trying to pass on information.
05-13-2015, 09:09 PM
#20
Adding context.... Higher octane is less prone to detonation, or the fuel igniting from high cylinder temperature, and compressing of the air by the turbo and piston. The fuel/air igniting before the spark event when the piston hasn't passed TDC is the potential event that's harmful to the engine.