A new feature has been added to voltstats.net to help volt drivers better understand their usage. Since people here have often asked about MPG_CS I though I'd share these here with some commentary. First, here is my overall MPG plot.. this is with 60day averaging to smooth out the data The red line is the MPG average, with the legend on the right.. top of plot is 900 MPG 60 day moving average. Where the red-line starts on the left, I was at about 200MPG, and as tiem progressed I learned better technique and took fewer airport runs (down to 1 every 6 weeks rather than every other week in the early fall). The Blue line is the car's lifetime average, mostly dragged down from the trip driving it from TX, where I had to go to buy it (they were not yet on sale in CO).. and its been slowly rising.. I expect with my travel patterns measured over the past year, where I'm averaging over 90% EV, that it will level off around somewhere between 340mpg-400mpg. The green line is my "volstats.net" ranking in percent (legend on left), and clearly I'm a slaggard there with poor overall ranking. Here is the MPG_CS plot, again 60 day moving average. Same meaning for colors. So there some things to note. My tank was filled at the end of October, with 85 octane, which the Volt did not like so well. You can see the MPG_CS take a dive as soon as that starts getting averaged in. I filled again April, this time with preimum ,and MPG_CS returns back to closer to 40mpg.. (recall its a 60 day moving average so its not a rapid change). The other thing to see is the strong correlation with the MPG.. in periods where there is almost no ICE usage, the MPG will soar, but the MPG_CS will plummit especially in the winter because the ICE running for temp, or for maintenance, in very cold temps and only running for 2mins has horrible MPG_CS, but since the ICE is not really being used the overall MPG 600+.. so the low MPG_CS does not really matter in that period. The "peak/plateau" in in MPG for feb and early march is matched by the valley in MPG_CS. The effect is much lower in april, but MPG_CS picks up in May just when I took a longer trip (on good gas) and the MPG drops as the MPG_CS rises. Anyone can go to voltstats.net and select a driver then select "reading history" to see similar plots. Enjoy the data..
Voltstats still uses the onstar data right? I noticed in my last onstar report that it is not picking up all of my trips. I noticed it when one of my graphs for last week showed I had used a lot of gas and almost no EV miles. Then I realized it missed my trip from home to Wilmington, which was almost all EV, but did pick up the trip home (that was all gas). I don't know if it makes a difference but the trip into town ended inside a parking garage (might that have caused interference with the onstar data collection?).
Yes.. onstar is the source, and yes if you park in a bunker it may miss a collection of data. It only pulls the current data, the API does not have a history function (though lifetime MPG is accumlative) Still way more accurate than most people self-recording would be.
