If the Volt was registered on the Volstats web site then the data should be there for the vehicle VIN. If the Volt was registered by the previous owner on My.Chevrolet.com there is some data there that can provide the lifetime ICE and electric miles. If none of those apply look at the lifetime MPGe number for the Volt. If under 70 MPGe then the vehicle was driven more on gas than electric. The higher the MPGe number the more miles were pure electric motoring.
There's lot of ways EPA_MPG could be wrong for a specific trip or season, but .... over all, those factors balance out pretty well and you end up seeing numbers that are pretty close to reading determined other ways. Within a handful of percent either way, especially on cars that have enough miles that the OnStar data might not be available.
The one exception is if someone reset the lifetime MPG.
Here is a screen shot from voltstats.net for our 2016 Volt.
If you subtract EV miles from Total miles you will have gas only miles
for our Volt gas only miles is 31,309. We use the gas engine a lot as most
of our trips go far outside the ev range of 40-65 miles depending on the time of
year, winter less, summer more. In our case MPGCS of 50.33 equal mpg
when operating on gas for that 31,309 miles. That beats our 2010 Prius which
averages about 48 MPG.
Location: Seaside, OR
Last Updated: 5/24/2020 11:12:23 PM CST
EV Miles: 56180.53 #379 / 84.8%
Total Miles: 87489.73 #370 / 85.2%
EV %: 64.2% #1687 / 32.3%
MPG: 140.63 #1270 / 49.1%
MPGe: 75.94 #948 / 62.0%
MPGCS: 50.33 #116 / 95.4%
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