I only use ECO when range challenged, does make a difference for me as without ECO, I like the quick starts off the line
B mode rather than brake as soon as I see red light ahead, recharge even if only a little. As I recharge every night (unless I know I'm not pushing limits of range the next day), 220v 30AMP, I have 100% every morning.
This is our around town vehicle, use each day ranges from 10 - 95%, yes, made it home in turtle mode at least 3 times since owning 02/2020.
Hoping to resolve same battery issue of sudden turtle mode on freeway with 60% + on the meter, each of 6 times in past year was on freeway. I would like to reach 100,000 + on this 2016, bought used with 32k. The 2015 I bought used with 149 miles, yes it as a steal, made it to almost 57k miles before someone ran stop sign & totaled it.
The Leaf is a great around town vehicle for everyday use.