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5 miles / kWh sounds about right - that is what I was getting in the summer when I first got my Bolt and was being a bit careful on efficiency. That was also with the stock Michelin Energy Saver tires.
Swapping to Michelin Pilot Sport high performance tires and not caring to much about efficiency or HVAC use I'm down to 4.0 to 4.2 miles / kWh and 250 miles of range. At 2 cents per mile I'm happy.
I was a bit surprised about how much the tires cut range and efficiency. From putting performance all-seasons on my TDI, 05 Prius, 09 Prius, and Spark EV I was expecting a drop of about 10% from the garbage stock LRR all-seasons. On the Bolt the drop has been 17%. Don't know if that is due to the Bolt or the Pilot Sports.
However the extra grip is well worth the extra cost to charge the Bolt. They already saved my bacon once when a car suddenly pulled out directly in front of me from a side street and I have to brake and swerve to miss him by inches.
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