gpsman wrote:I have done as close to a scientific measurement as possible.
I went an entire “tank” at 3.9 to 4.0 miles per kWh.
(3.96 miles per kWh is the EPA rating of 238 miles per full charge.)
Then I did a full charge.
When new, this = 238 miles.
Now, at 10 months and 10,400 miles, I get 234 miles.
A loss of 4 miles, which I attribute to age.
A loss of roughly 2% in roughly 10,000 miles.
If this keeps up (2% per 10,000 miles, 20% lost per 100,000 miles) that is pretty good.
At 100,000 miles on the odometer, it is resonable to expect .80 x 238 or 190 miles of range, when driving at an average of 3.9 miles per kWh.
The only way that would be scientifically useful is if you did that experiment a few thousand times and had all the same variables. Temperature, air density, wind speed, tire pressure, travel route, car weight, etc... would all have to be the same. That "loss" of 4 miles could just be within the error bars of your experiments.
Now lets say you did lose 2%, which could be very possible. Degradation of batteries is not a linear relationship. The Tesla people who have done this experiment showed the greatest lost of battery within the first 20,000 miles of being driven. After that, the battery degradation seems to slow down.
Only time will tell... It was also be variable amongst users. Some people may experience 30% loss after 3 years with minimal use. Some people may still have 90% battery after 300,000 miles driven. The Bolt has the newest generation of lithium ion batteries with an active cooling system. I didn't by a Leaf because of the high temps in my area and their passive cooling system. We need to compare the Bolt's battery degradation to the Volt and Tesla. The issues have been minimal with battery loss with those two examples, even with well over 100,000 miles driven in electric mode only. I use hilltop reserve because of the research that has been done with batteries, but we don't even know if GM gave us a buffer on the supposedly 60 kWh battery.