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Old 10-01-2007, 12:27 PM   #1
jmharn
 
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Yaris Color and MPG Statistics/Summary

Hi all,

After reading the topics as "WHat color is your Yaris" and "Fuel Economy", I thought I summarize them.

Just several notes on the MPG:
1. I took 30 samples of reported data in the following format only: distance travelled and fuel pumped. I tend not to include the data that just says: "I got about 38 MPG on my Yaris", because I think there might be some inaccuracies in the rounding up or calculation. (Trying to be as objective as I can).

2. The graph is not a "Normal Distribution". Thus, it is a possibilities that the folks who reported "higher MPG than the rest of the population" might have a significant different driving habits.

3. Most of the data I got were from Liftback. Not many from Sedan for some reasons.

Hope it's useful.
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Old 10-01-2007, 01:20 PM   #2
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I wonder if there's a correlation between colour and fuel consumption?

Cool stats, thanks for posting.
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Old 10-01-2007, 01:29 PM   #3
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very interesting!

btw, welcome, number cruncher
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Old 10-01-2007, 01:47 PM   #4
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Originally Posted by voodoo22 View Post
I wonder if there's a correlation between colour and fuel consumption?

I was thinking the exact same thing. I bet there actually is; maybe something like "fuel consumption" ~ "personality" ~ "color choice" with the link being how personality effects driving habits/style.
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Old 10-01-2007, 01:51 PM   #5
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you just gave me a terrifying reminder why i hated my 400-level measurements.
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Old 10-01-2007, 01:52 PM   #6
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aren't you forgrtting a very important variable, i.e. the owner's mother-in-law's age?
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Old 10-01-2007, 02:05 PM   #7
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hmmm....interesting.... if people are reporting their mother in law's age, perhaps I can see some correlation.

Are you thinking the older their mother in law, the faster they drive in attempt to.... :)
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Old 10-01-2007, 02:10 PM   #8
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Sorry all,

I forgot to say that based on the data, the average MPG is 34.35 miles per gallon with +/- 3.3 miles per gallon. My point is that it is a bit on the lower side of what Toyota reported.

However, it is also interesting that for the 2008, Toyota lowers their MPG specs to 29/35MPG due to the difference in governmental policy on how to conduct the test.
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Old 10-01-2007, 02:33 PM   #9
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[QUOTE=voodoo22;146693]I wonder if there's a correlation between colour and fuel consumption?

Unfortunately, the two sets of data comes from a completely separate samples (from two separate threads). Thus, cannot get a direct correlation.

But, if we were to run another thread that will log the MPG AND ask them what color of their Yaris, we might be able to prove or disprove the proposed correlation.

If anyone is interested, just report:
1. L/B or Sedan
2. Color
3. distance travelled AND gallons or liter pumped.
4. Mother in law's age
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Old 10-01-2007, 07:38 PM   #10
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If anyone is interested, just report:
1. Sedan
2. Pacific Blue
3. 8193 km and 436.214 litre's
4. Mother in law's age is 71, but she lives in Japan so I don't need to be too worried.

I bet there is a correlation between mother in laws age and FE, because I would guess that if your mother in law is older so are you, and you are therefore more likely to drive more responsibly. Let the number crunching begin!
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Old 11-18-2008, 05:49 PM   #11
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If you were going to use correlation, you would need a lot larger of a sample size because the data for fuel consumption is skewed right in this example. If you drew more people from the population your data would become more normally distributed... or at least should. You would also want to take into account many other possible confounds... like, age of the driver, where they drive, % city, temperature, and altitude. You could find some pretty cool correlations, but should approach it scientifically to extrapolate the results to those outside of the sample. Oh, and I have a hypothesis: Those who drive the color "Black" Yaris, will see lower mean MPG than the other colors. Just a hunch because, from what I have seen, the black ones are usually modified, and I would imagine the modified car drivers do not care too much for efficiency. Even more interesting... You could run a regression... but, you would have to code the colors because it is a categorical variable. The regression would let you know things like... a person of this age should get this MPG... a person from this place should get this MPG.

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Old 11-18-2008, 06:08 PM   #12
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Wow you have time on your hands!
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Old 11-18-2008, 06:20 PM   #13
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Wow you have time on your hands!
If this is in reference to me... I am psychology major, and we do a lot of research methodology stuff.

If not... Yeah, that guy has a lot of time on his hands...

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Old 11-18-2008, 06:23 PM   #14
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Just as I suspected, Blazing Blue gets better mpg than Bayou Blue, well except for in my house.
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Old 11-18-2008, 08:32 PM   #15
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It's a great idea for a basic graph, but your sample size seems a bit limited. You should include further rejection parameters into the box plot, or else it may end up looking skewed, where it should theoretically be a normal distribution. I would also try using a 5-point standard deviation considering the range extends from the high 20's to high 40's in MPG.

Which program did you use to graph this? Got a Minitab key I can steal I'm just finishing off a stats class and my trial version is almost over, and I can't re-install it afterwards.
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Old 11-19-2008, 12:33 AM   #16
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1. Liftback
2. Meteorite Metallic
3. 375 Miles and 11 Gal
4. Mother in law's age: N/A. Guess single guys still get somewhat decent MPG
5. Number of windows in apartment: 10
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Old 11-19-2008, 07:09 AM   #17
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Quote:
Originally Posted by voodoo22 View Post
If anyone is interested, just report:
1. Sedan
2. Pacific Blue
3. 8193 km and 436.214 litre's
4. Mother in law's age is 71, but she lives in Japan so I don't need to be too worried.

I bet there is a correlation between mother in laws age and FE, because I would guess that if your mother in law is older so are you, and you are therefore more likely to drive more responsibly. Let the number crunching begin!
I think this thread is dead. It's been so long since anyone added to it.

I'm up to about 40702 km's on 2092 litre's now and my mother in law is 72.
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Old 11-19-2008, 12:01 PM   #18
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Quote:
Originally Posted by voodoo22 View Post
I think this thread is dead. It's been so long since anyone added to it.

I'm up to about 40702 km's on 2092 litre's now and my mother in law is 72.
I presume, as dead as Bernie Mac...

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