Long time lurker. Really appreciate the help on eliminated the beep on my Prius V and helped and changing the battery on the TCH. I used an Optima Yellow as many on here have. I tried having the car connected to another battery for backup but the positive jumper slipped off for a second when I moved the old battery out. But no problems everything seems to be running correctly.

However the message at the end when you turn the car off that says excellent or whatever if you average more than 35 mpg has quit coming on. Is this something that can be reset with a code reader?

Thanks!

 

I think it will come back by itself, as far as you drive car more. You basically reset all data in ECM.
That's why I do NOT want to use clamp on battery backup, but go through 12V outlet. Clamps do slide off.