How do you reset the number of EV miles?

Your car battery is 8 years old - you might not get 11 miles EV range because of degradation. The only way to tell is to fully charge then use it up completely in a test run, optimal conditions.
I wouldn't bother trying to force a reset, it will adapt to your driving quite quickly.

 

Yes, disconnecting the 12V battery won't magically give you those miles back - it may report more miles, but it's just an estimation, and you're resetting the data for how it calculates the estimation.

 

You can try an obd, but I don’t recall anyone ever doing it

 

See my post from earlier this month for the 2nd graphic test run on EV...
https://priuschat.com/threads/a-tale-of-two-summer-tyres-tires.213678/unread

 

Good result. Round trip?

 

what was the outside temp?

the daily doesn't change much, i'll guess .1 mile up

 

You can largely ignore what the car says you will get for EV range. If you flog it, the actual range will be way less than predicted. If you drive intelligently, you'll probably go farther than predicted. That's all it is is a prediction based on previous driving. I usually thought of it as a score card for how efficient I was on the last drive.

How far you actually go is an indication of battery health but will vary with driving style, weather, and speed. Anticipating stops and taking your foot off the "gas" early when traffic permits will do the most to increase range. Slower speeds make a big difference, too. And cold weather will reduce range.

To know the actual battery capacity, you need a Killawatt meter or some other meter to measure how many kWh it takes to charge the battery from 0 EV range to full. It will show a little more than what actually goes into the battery due to heat loss, running the charger fan, and so on, but it reasonably close and you can see the trend as it ages.

It is a bit of a shame that they didn't give the option to view SOC% rather than estimated miles. They fixed that on the Prime. I prefer the percentage, too, but when I'm almost out of EV range, the miles indicator can be handy.

You can "stack" the EV miles this way. If you make a couple stops in quick succession or go down a hill in HV, you can put it in EV momentarily. When you go back to HV, that'll be the new SOC it'll try to maintain. It doesn't gain you anything as far as gas mileage, but it's kind of fun to play with, especially if you're anticipating some slow driving for a while and wan't more EV available for that.