Volt Stats Website / Source Code

[edschen]

Right now, electric miles driven in a day simply subtracts your last reading for any given day from your first reading for any given day. I might look into changing it to be any 24-hour period, but that's a bit more complicated.

OK. That means there's a decent chance miles driven post-midnight will be lost in the ether. If nothing else, I'd go "last reading from day n" minus "last reading from day n-1". That might overestimate slightly, but doesn't leave that several hour gap.

[Fluke]

I've got a couple of future enhancement suggestions for your (great ) website:

1. For the map page, allow selection of what parameter is used to color the markers (total miles, EV miles, Achievements, CS/MPG/MPGe, etc.)
2. Display tire pressure for each wheel on the car detail page.
3. On the Home Page/Monthly Totals tab, clicking on the month could take you to the leaderboard sorted by that date range.

With GM's new update to the efficiency page on myvolt.com, do you have access to any of the displayed efficiency parameters/calculations (kW-h/100 miles, etc.)?

[mrosack]

Good ideas, thanks. I've been a bit lazy about working on the site lately, I'll try to get some of them implemented, though.

I still don't have the efficiency information available through the mobile webservice. I might take a look to see if I can reverse-engineer whatever webservice myvolt.com is talking to, but the problem in my mind is that I'm not sure how I'd reconcile the two datasets. What we really need is a lifetime kw-hrs consumed number, but all I see in the efficiency area is averages. I guess we could use the average to calculate your MPGe over the past month or so, but I'm struggling to figure out anything else to do with it.

In a related note, see the attached screenshot of my car's efficiency reading from myvolt.com. I just got my Volt back from the shop last week for a battery replacement, and I drove to Chicago this weekend, so that might partially explain the weird numbers, but not totally...

efficiency.jpg

[mrosack]

The Electric Miles per Day achievement is now fixed to look at any 24 hour period, let me know if you still think you're missing any miles.

I've started a blog for the site at voltstats.blogspot.com. I'm going to start transitioning updates/announcements over there, since this thread is getting really bloated.

[BrentW]

I see the first 2012 model is now being tracked.

http://www.voltstats.net/Stats/Details/89

welcome!

[mrosack]

Yup, not only a 2012, but the second Wisconsin Volt on the site! Hope to see more of both soon!

Also, I made an update to the site yesterday to support multiple Volts per Onstar account, but there's no one (registered) with 2 Volts right now. Hopefully it works!

[solar_dave]

Yup, not only a 2012, but the second Wisconsin Volt on the site! Hope to see more of both soon!

Also, I made an update to the site yesterday to support multiple Volts per Onstar account, but there's no one (registered) with 2 Volts right now. Hopefully it works!

Just waiting delivery on number 2

[tboult]

On the onstar site there is a 'history' page where you can view mileage info and even download it in CSV, etc.
Here is what my data currently looks like.

View as table most recent data Download: CSV | XLS | PDF Print
Email Date | Odometer Reading | Distance Since Last Reading | Average Daily Driving
03/01/2011 | 1002 | --|--
03/31/2011 | 2303 | 1301 | 43
05/01/2011 | 3395 | 1092 | 36

I've tried the onstar stats and it shows almost nothing. With volt stats I can download cvs (have to login) but its showing lots of useful data every 6 hours... (maynot format well here.. but is easy to use as it is excel). I find the battery level with details useful for my A/B route and technique testing. (I use the iphone app too, if I want to test intermediate points, but volt stats is easier to get multi-day data for comparison).

Here is some of my data from voltstat (transposed to be more readable)

<pre>


ReadingTimestamp	        8/25/11 15:34	             8/25/11 10:34	        8/25/11 4:34
GallonsBurned	          	19.44681	          	19.33914	          	19.33914	    
FillUpDetected	          	FALSE	          	        FALSE	          	        FALSE	        
BatteryLevel	          	70.58808	          	89.80372	          	25.09798	    
ChargeState	          	not_charging	          	charging	          	charging	    
LifetimeFuelEcon	        60.68534	          	60.21491	          	60.21491
LifetimeEvMiles	          	381.99746	          	366.3661	          	366.3661	
LifetimeMiles	          	1180.13621	          	1164.50488	          	1164.50488	
LastTripFuelEcon	        250.97398	          	250.97398	          	250.9739
LastTripEvMiles	          	15.61403	          	51.0634	          	        51.0634	          	
LastTripMiles	          	15.62165	          	51.08834	          	51.08834	
GallonsOfGas	          	3.50576	          	        3.54228	          	        3.54228	
OilLife	          	        90.19588	          	90.58804	          	90.58804	        
TirePressure_RF	          	38.28995	          	33.0686	          	        34.2289	          	
TirePressure_RR	          	38.28995	          	34.2289	          	        34.2289	          	
TirePressure_LF	          	38.28995	          	33.64875	          	34.80905	
TirePressure_LR	          	37.12965	          	34.2289	          	        34.2289	          	

</pre>

At least for me I really like the added detail and frequency.
Some things are weird like my gas level bouncing up and down, but I've see that on my iphone as well as some days it reports 3gal and some it says 4, even when the car is sitting in exactly the same spot in my garage.

Thanks again to Mike for this useful site.

[tboult]

And now for a question coming from my analysis of my data..
Has anyone seen their gas number bounding around.. my iphone reports 3gal one day 4 the next.. and its wandered back and forth. (and I've not put any in, and should not have used any either). But my MPGcs, bounces too. Here is the Gass and milaage data and in my car for the past Week
GallonsOfGas GallonsBurned LastTripEvMiles LastTripMiles ReadingTimestamp
3.50576 19.44681 15.61403 15.62165 8/25/11 15:34
3.54228 19.33914 51.06340 51.08834 8/25/11 10:34
3.54228 19.33914 51.06340 51.08834 8/25/11 4:34
3.54228 19.38342 49.18079 49.20481 8/25/11 1:32
3.50576 19.30416 35.34263 35.35989 8/24/11 20:31
3.54228 19.24220 42.42668 42.44740 8/24/11 10:32
3.54228 19.24220 42.42668 42.44740 8/24/11 4:36
3.54228 19.24220 42.42668 42.44740 8/24/11 1:34
3.39621 19.15855 24.07607 24.08783 8/23/11 20:34
3.54228 19.16836 15.62373 15.63136 8/23/11 15:35
3.43273 19.13058 32.43137 32.44721 8/23/11 10:33
3.39621 19.13058 32.43137 32.44721 8/23/11 4:36
3.43273 19.13058 32.43137 32.44721 8/23/11 1:36
3.54228 19.07040 15.61403 15.62165 8/22/11 20:33
3.54228 19.07040 15.61403 15.62165 8/22/11 15:34
3.39621 19.03056 0.00970 0.00971 8/22/11 10:36
3.39621 19.03056 0.00970 0.00971 8/22/11 4:35
3.39621 19.03056 0.00970 0.00971 8/22/11 1:34
3.39621 19.03056 0.00970 0.00971 8/21/11 20:34
3.39621 19.03038 0.00000 0.00000 8/21/11 15:35
3.39621 19.03038 0.00000 0.00000 8/21/11 10:34
3.39621 19.03038 0.00000 0.00000 8/21/11 4:35
3.39621 19.03038 0.00000 0.00000 8/21/11 1:37
3.39621 19.03038 0.00000 0.00000 8/20/11 20:34
3.43273 19.03038 0.00000 0.00000 8/20/11 15:35
3.54228 19.03020 37.17672 37.19487 8/20/11 10:33
3.54228 19.03020 37.17672 37.19487 8/20/11 4:38
3.50576 19.03020 37.17672 37.19487 8/20/11 1:36
3.39621 18.96858 20.44671 20.45669 8/19/11 20:33
3.50576 19.00108 17.71984 17.72849 8/19/11 15:35
3.54228 18.91926 32.92629 32.94237 8/19/11 10:34
3.54228 18.91926 32.92629 32.94237 8/19/11 4:34
3.54228 18.91926 32.92629 32.94237 8/19/11 1:35
3.43273 18.88172 17.62279 17.63140 8/18/11 20:34
3.54228 18.84323 15.61403 15.62165 8/18/11 15:35

In this time I've been 100% EV.. but the gas numbers from onstar are wildly varying and the millage EV != Milage for most trips
(I've returned home with EV miles left on the gauge).
Here are the differences

Gas Diff Burned Diff Milage Dif ReadingTimestamp
-0.03652 0.10767 -0.00762 8/25/11 15:34
0.00000 0.00000 -0.02494 8/25/11 10:34
0.00000 -0.04428 -0.02494 8/25/11 4:34
0.03652 0.07926 -0.02402 8/25/11 1:32
-0.03652 0.06196 -0.01726 8/24/11 20:31
0.00000 0.00000 -0.02072 8/24/11 10:32
0.00000 0.00000 -0.02072 8/24/11 4:36
0.14607 0.08365 -0.02072 8/24/11 1:34
-0.14607 -0.00981 -0.01176 8/23/11 20:34
0.10955 0.03778 -0.00763 8/23/11 15:35
0.03652 0.00000 -0.01584 8/23/11 10:33
-0.03652 0.00000 -0.01584 8/23/11 4:36
-0.10955 0.06018 -0.01584 8/23/11 1:36
0.00000 0.00000 -0.00762 8/22/11 20:33
0.14607 0.03984 -0.00762 8/22/11 15:34
0.00000 0.00000 -0.00001 8/22/11 10:36
0.00000 0.00000 -0.00001 8/22/11 4:35
0.00000 0.00000 -0.00001 8/22/11 1:34
0.00000 0.00018 -0.00001 8/21/11 20:34
0.00000 0.00000 0.00000 8/21/11 15:35
0.00000 0.00000 0.00000 8/21/11 10:34
0.00000 0.00000 0.00000 8/21/11 4:35
0.00000 0.00000 0.00000 8/21/11 1:37
-0.03652 0.00000 0.00000 8/20/11 20:34
-0.10955 0.00018 0.00000 8/20/11 15:35
0.00000 0.00000 -0.01815 8/20/11 10:33
0.03652 0.00000 -0.01815 8/20/11 4:38
0.10955 0.06162 -0.01815 8/20/11 1:36
-0.10955 -0.03250 -0.00998 8/19/11 20:33
-0.03652 0.08182 -0.00865 8/19/11 15:35
0.00000 0.00000 -0.01608 8/19/11 10:34
0.00000 0.00000 -0.01608 8/19/11 4:34
0.10955 0.03754 -0.01608 8/19/11 1:35
-0.10955 0.03849 -0.00861 8/18/11 20:34
-0.00107 0.01775 -0.00762 8/18/11 15:35

-0.00107 0.01775 -0.01088 Mean Difference
0.06831 0.03478 0.00851 Mean Difference
0.02974 0.01514 0.00370 99% Confidence Interval (P=.01)
nnnnnn yyyyyyy yyyyyyy Is Statistically Significant?


Thus the Gallons of gas is approximately random, but with mean zero and no statistically bias.
However the GallonsBurned has a statistically significant bias. Its incrementing by about .0177 gallon every 6 hours.. or showing a increase of about .5 gallons per week. The Gap between EV miles and Total miles is biased (too low) is is very statistically difference. Thus the MPGcs is getting consistently worse as it thinks the car is burning gas (when I should not be) and accumulating non-ev Miles. In the past week my car "lost" .6 gallons and .36miles. Both are slow but over the week consistent and in the long run will be very noticeable.

I've seen posts that onstar is making other errors.. anyone else pulling data regularly and seeing anything like this?
I'm assuming its nothing in volt stats (as its hard to imagine what they could do to mess this up).

[AttyVette]

Thanks for this site..I appreciate you setting it up for us!