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  #11  
Old 09-28-2011, 06:02 PM
Red paint Red paint is offline
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How you drive, how hot it is, how windy ect effect your gas milage. Adding a tuner will most likely hurt more than help. Intake and exhaust sound Great but make no difference. Ford has new motors out. They get 1 to 2 miles better. They spent a billion on design if I read that right. So if I just change my intake, add a flow master I get the same results ? don't tell Ford they will be pissed !! Just saying. By the way I have installed LOTS of this stuff on my trucks ( I'm a contractor ) work em like dogs. I like everything about them, how they look , sound, but never will you get 1 mpg gain nor will they claim you will.....
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  #12  
Old 09-28-2011, 06:10 PM
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Quote:
How you drive, how hot it is, how windy ect effect your gas milage. Adding a tuner will most likely hurt more than help. Intake and exhaust sound Great but make no difference. Ford has new motors out. They get 1 to 2 miles better. They spent a billion on design if I read that right. So if I just change my intake, add a flow master I get the same results ? don't tell Ford they will be pissed !! Just saying. By the way I have installed LOTS of this stuff on my trucks ( I'm a contractor ) work em like dogs. I like everything about them, how they look , sound, but never will you get 1 mpg gain nor will they claim you will...
Not true man. Keep in mind manufacturers have to design their intakes/exhausts/programming for ALL people. Meaning the tune has to be able to tow safely(can't advance timing too far or would detonate under heavy load), intake has to be sealed up enough to not suck in water and excessive dirt, and has to be quiet, and exhaust has to be quiet. Us here want performance for the most part, and don't care about how loud it is. I also can make a ram air that sucks air from under the bumper(manufacturer can't do this as it's too high a risk, but for me it works as I'm on pavement 99% of the time). A decent intake/exhaust can typically be worth 0-2mpg depending on a ton of factors. A tuner, is usually worth about 1 mpg, mine was worth probably more like 2 mpg, especially at hwy speeds. The downfall is if I want to tow/haul I have to re tune, as I can't run this much timing advance with a load without causing engine damage. It's a lot more complicated that a simple statement, there are so many factors for every mod...

All that said, I find it amazing that manufacturers get the hp/mpg out of these things with all the restrictions/emissions they deal with...
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  #13  
Old 09-28-2011, 06:52 PM
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Gas prices here recently dropped from "F**n outrageous" to "very expensive"
I thought this was a good time to do the octane experiment.
I have now run 4 full tanks of 89 in my 11 Ram Sport.
My conclusion is no benefit in power or gas mileage.
I'm going back to 87 and saving my $ for a new Y pipe and Magnaflow.
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Old 09-29-2011, 05:24 PM
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Yes, that's right, I'm thankful it's cheaper than it was, 306 here in Dallas
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Old 09-29-2011, 07:06 PM
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Quote:
Originally Posted by FireWire View Post
Gas prices here recently dropped from "F**n outrageous" to "very expensive"
I thought this was a good time to do the octane experiment.
I have now run 4 full tanks of 89 in my 11 Ram Sport.
My conclusion is no benefit in power or gas mileage.
I'm going back to 87 and saving my $ for a new Y pipe and Magnaflow.
this is exactly where i am at, 4th tank of mid grade sunoco, no difference in preformance or mpg. just wondering why the manual says mid grade but reg is acceptable.
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  #16  
Old 09-29-2011, 07:11 PM
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In my truck, ive noticed in total of my fuel tank, i will get an additional 40-50 miles using 89 than if I used 87.
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  #17  
Old 10-01-2011, 02:24 AM
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Its definitely possible for a truck to run better on lower octane fuel. While fast flame travel high octane fuels can be built (Think high dollar Superbike Race Fuel) typically lower octane fuels have faster flame travel speeds.

What does that mean? It means higher octane fuel generally needs more ignition advance for peak cylinder pressures to occur at the same time. So if you use 93 when the engine doesnt need it you have effectively retarded the ignition timing.

Basically its best to run just enough octane to avoid detonation and preignition with the PCM at the max advance it has mapped.
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  #18  
Old 10-01-2011, 08:50 AM
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^ that's why you should run the lowest octane you can without causing pinging
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  #19  
Old 10-01-2011, 09:34 AM
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But don't ya need the 91 Octane to run a 91 tune
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  #20  
Old 10-01-2011, 09:43 AM
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It would be interesting to know the difference with all things being equal.
Same truck, 87 vs 89 on a dyno or at the strip.
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