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Inconsistencies between Miles Remaining and Usage

3512 Views 8 Replies 5 Participants Last post by  Dewg
Since the factory recall updates my Bolt is giving me some inconsistencies on mileage.

Full charge. Hill-top reserve is on, so should be charging about 90% of the pack, or 54kWh.

Range remaining on the dash shows 200 miles when I fire up the car. Now I drive about 4 miles per kWh, which can be confirmed on the usage display on the center console screen. It'll say kWh used since last charge: 1kWh. Miles driven: 4.0 Miles. And it stays pretty consistent for me: 2.0kWh used, 8.2 Miles. So based on that, I should be getting about 216 miles on my 54kWh charge.

So while I'm driving, the battery gauge will start dropping as normal, but seems to drop much faster. Each bar on the battery gauge is 3kWh (as there are 20 bars and the pack is 60kWh). So at "half a tank" I should have 30kWh of battery left, or 120 miles of range.

But after a long drive, I'll get home and the battery gauge says I have just over 1/4 tank left (6 bars), but the usage display on the center console screen says I've used 26kWh and gone about 105 miles.

So which is more accurate? The battery gauge on the dash, which seems to indicate I have 18kWh of power left (6 bars) which translates to 72 miles left - or the usage display which says I have used 26kWh, which should leave me with 28kWh left (54 at charge and 26 used), which would be 112 miles left...

Or is this indicating I have battery loss?!?!
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There's been a great deal written here about post-recall inconsistencies in range. The best recommendation is to drive it and charge it for a few cycles until it settles down. Apparently, a lot of the running data totals were wiped out with the old firmware, and the vehicle needs to re-establish its norms.

There's some question as to the starting capacity of the traction pack, so assuming it's 60kWh isn't necessarily a good idea.

IMO, there are so many freakin' variables involved in what to expect for range, that getting an accurate prediction is nigh impossible. My philosophy has been to use the displays as a "suggestion", and work from my experience with the vehicle, i.e. "gut feel", to make corrections. I have striven to *never* let any EV traction pack get to less than 10% of its capacity, but that's just me.

Th best info available appears to be from the OBD port, and there are a couple of threads here telling how to access that. One of the pieces of info there is a running calculation of pack capacity. Packs seems to vary by two or three kWh. Individual packs seem to vary plus or minus a few tenths of a kWh or so, on any given pack on any given day, phase of the moon, or weather.>:)

There's a reason that we call the miles remaining display the "GOM", for Guess-O-Meter.

I'd recommend reading as much about this on the several threads that address it, and developing your own "feel" for what to believe on the display in *your* Bolt..
Thanks Greg!! I'm totally with you on the miles remaining being the GOM. But is the usage display on the touch-screen accurate? When it says I've used 8.2kWh since my last full charge, is that 8.2kWh accurate or also just an estimate?
I did the recall updates many weeks ago, and have gone through dozens of recharge cycles since then. I guess I'll just look at the energy usage stats on the touchscreen as "accurate" and ignore the dashboard miles remaining and battery charge bars as totally inaccurate. Sucks I have to do constant math in my head to figure out how many miles I have left, but oh well... :-(
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