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Old 04-03-2013, 10:10 AM   #91
Knows a couple things...

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Originally Posted by s14sh3r View Post
The mileage test also needs to be long term to get an average. I think that would be more accurate than driving 200 miles and comparing.

Needs more science!
Exactly. It is also human nature to try to produce the results, often subconciously, that you expect or desire. Some will install some product that claims better mpg... so after they install it, they drive the vehicle in such a way that often they will see better mpg & then scream to the world how it improved their mpg. But without realizing it overtly, they had been driving differently, sometimes subconciously, to produce those results. Driving a little slower, accelerating a little more easily, on a highway trip instead of around town, etc.

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Old 04-03-2013, 10:16 AM   #92
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Exactly. It is also human nature to try to produce the results, often subconciously, that you expect or desire. Some will install some product that claims better mpg... so after they install it, they drive the vehicle in such a way that often they will see better mpg & then scream to the world how it improved their mpg. But without realizing it overtly, they had been driving differently, sometimes subconciously, to produce those results. Driving a little slower, accelerating a little more easily, on a highway trip instead of around town, etc.
Yep. This is why double blind studies work so well. People also forget about statistical error. There are so many variables in driving a vehicle that it's pretty much impossible to create identical situations between tests. Anything less than statistical testing of a large group over a period of time would be considered anecdotal.

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Old 04-03-2013, 10:49 AM   #93
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You have a GPS that monitors fuel economy? How does it know how much fuel is in the tank.
I am sure he is saying GPS verified "miles driven" not, GPS calculated MPG
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Old 04-03-2013, 10:51 AM   #94
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Yep. This is why double blind studies work so well. People also forget about statistical error. There are so many variables in driving a vehicle that it's pretty much impossible to create identical situations between tests. Anything less than statistical testing of a large group over a period of time would be considered anecdotal.
Finally someone understands statistics! The jeep and dyno are pretty repeatable, but . Here are back to back pulls with the stock setup.

The 3SD (99%) value is 2.79hp, so the average HP for these pulls (140.9hp) can vary between 138.1 and 143.7 hp.
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Old 04-03-2013, 02:37 PM   #95
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That is correct, most people will take the highest outlier, and claim it is the best thing since sliced bread, and completely ignore the rest of the data.
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Old 04-03-2013, 02:40 PM   #96
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Would someone trying to figure out something like this take all the results and average them? I understand you'll want to show the absolute best vs absolute worst, but someone armed with this info can just average all of the runs and make their own decision as to whether its worth it or not.

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