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Topic Review (Newest First)
04-21-2012 10:55 PM
kam327
Quote:
Originally Posted by twoblue View Post
All variables need to be accounted for to be scientific or at least kind of accurate. You've compiled some interesting numbers but without all extraneous variables factored in or out. That is all they are.
That's all they're meant to be since that's all that's possible with the fuelly data. Everyone's free to interpret them as they like.
04-21-2012 10:15 PM
ElectricAL I would recommend throwing out the 13mpg gainer. That is a definite statistical anomaly or outlier and as such should best be viewed with suspicion. But it's your "gig" so do what you like...
04-21-2012 09:47 PM
twoblue It is also entirely possible that one or more of these cars belong to a parent whose child came of driving age during this span and shared the car, or the opposite shared at the beginning then got their own car. All variables need to be accounted for to be scientific or at least kind of accurate. You've compiled some interesting numbers but without all extraneous variables factored in or out. That is all they are.
04-21-2012 10:15 AM
BrApple
Quote:
Originally Posted by kam327 View Post
By the way, I had a '99 Contour Sport for 6 years. I wish I could go back in time and drive it new again to compare it to the Focus. Would probably still compare well in handling and power. I remember that 2.5L V6 being silky smooth. Of course the 4-speed killed economy - 24 or so overall and the most I could get on a highway trip was 27.
I think that the cars are close. the V6 has more torque. There is something about the secondaries openning that the variable cam timing on the Focus just doesn't match. It has the same MTX-75 so on that end the driving experience is the same. It also a bigger car so that factors into it.

I was getting about the same mpg with mine, at 156k miles.
04-21-2012 10:00 AM
kam327
Quote:
Originally Posted by BrApple View Post
Thats pretty interesting data. I have found that my mpg has been increasing. But as noted there could be two things with that, I got the car this past Feb and the last few tanks I have only been doing 65 instead of 68 to 72 on the highway. I would say most of my driving is highway. the last two or three tanks I have broken 400 miles to the tank, but again had a bit more highway driving then before.

Looking at the graph I know the first two low points, besides the very first fill up, where Stop and Shop gas, where as every other tank has been Mobil.

As another point of interest, I wonder how many have ethanol in the gas and what percent, would be interesting to see how that plays into things.

Thanks for the addition. Yeah admittedly there are all sorts of things that could be skewing the data. Probably number one is that we're just coming out of the winter season so that could've skewed the more recent data down a bit (winter blend gas). I'm thinking in July I'll do a July '11 to July '12 graph with a polynomial trend line to see if we can see the effects of the winter season.

By the way, I had a '99 Contour Sport for 6 years. I wish I could go back in time and drive it new again to compare it to the Focus. Would probably still compare well in handling and power. I remember that 2.5L V6 being silky smooth. Of course the 4-speed killed economy - 24 or so overall and the most I could get on a highway trip was 27.
04-21-2012 09:19 AM
BrApple Thats pretty interesting data. I have found that my mpg has been increasing. But as noted there could be two things with that, I got the car this past Feb and the last few tanks I have only been doing 65 instead of 68 to 72 on the highway. I would say most of my driving is highway. the last two or three tanks I have broken 400 miles to the tank, but again had a bit more highway driving then before.

Looking at the graph I know the first two low points, besides the very first fill up, where Stop and Shop gas, where as every other tank has been Mobil.

As another point of interest, I wonder how many have ethanol in the gas and what percent, would be interesting to see how that plays into things.

04-21-2012 08:10 AM
kam327
Quote:
Originally Posted by TitaniumGero View Post
I had a thought. Why don't we start the graph the day the car was bought(or sometime close) and end it in the 4th month, then make the same graph a year later with the same time frame. That way we could eliminate the weather factor and get more accurate results.
Good idea, though this will only be possible later in the summer. These cars started coming out just over a year ago. We'd need a good 16 months of data for what you recommend. To be revisited.....
04-21-2012 06:48 AM
Pcovers
Quote:
Originally Posted by kam327 View Post
Here are revised versions of the graphs.

In fuelly each mpg calc is accompanied by the % city driving on that tank, where the user posts it. I went through that data and eliminated tanks where the quoted % city was more than 20% away from the driver's overall average. So if someone averaged 45% city driving while owning the car, I deleted any data associated with less than 25% city or more than 65% city. That will help minimize the effects of different driving conditions (i.e. city vs highway).

Not surprisingly, I didn't have to delete that much data at all because most folks are pretty consistent.

I also replaced 4 drivers with others because they didn't list what % city each tank was.

I can't confirm that tank 1 for each of these drivers was their first tank since new. But logic says that with 30-70 tanks under their belts, the first 1 had to be pretty close to the first, if not the first. Most of these drivers' data starts in May, June or July of last year.

Finally I faded out the "spaghetti" to make the trendlines easier to see.

Not much has changed:

1 driver increased a huge 13mpg
4 drivers increased a modest 2-4 mpg
8 drivers remained flat
7 drivers decreased a modest 1-3 mpg

Enjoy and take what you want from it. It tells me that MPG is unlikely to change much from new for most folks. I know some have reported larger gains. There are always exceptions.
Kudos to you for the effort. While it may not stand peer review scrutiny for validity or reliability, it establishes far more basis for sound reasoning than the subjective, "You'll get a lot better mpg after the break in...".
04-21-2012 06:35 AM
Pcovers
Quote:
Originally Posted by TboneZX3 View Post
Yes, that is the problem. It is assuming too much to come to any general conclusions, IMO.
It is. at least, a reasonable demonstration of inductive reasoning that can build to a hypothesis. It is far better than the current alternative: a bunch of anecdotal reports with no basis in established science.
04-20-2012 10:44 PM
KaputtEqu1pment Just some food for thought; maybe this graph isn't as accurate in the classical sense. While it may portray a drop in mpg over time, i don't think it's actually because the engine has become worse or its efficiency is decreasing.

Rather, I think it's the novelty, or idea of high mpg's fading. For instance, when i first got my car, i tried everything i could possibly do within reason to hit and beat the estimated mpg rating. And for a car as sensitive as this, (a drop in 10 degrees fahrenheit, a slight drizzle, a head on breeze, a difference in 5mph, could decrease your avg mpg of ~40 to sub ~35 levels [highway of course]) i really tried hard to watch for any of these factors. After about 4 months, I just stopped caring--the novelty wore off. Screw it i said, i knows it gets good mpgs, now i'm going to drive it @ 70+. It could very well be that the graphs show that transition.

Edit:

As for the increase in efficiency for some of the drivers, they may have figured out how their driving habits affect the car's performance, and/or may have changed their habits to get better mileage. Maybe their driving routine has changed as well (I was totally joyriding for the first few weeks of owning the car... not so much anymore). Lots and lots of factors, especially on a car like this.
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