I disagree about L. When you’re in D you only get access to full regen when you hit the brake pedal we find it too hard to find the sweet spot on the brake pedal between when regen ends and when mechanical braking begins, causing us to waste energy on mechanical braking when we were hitting the brake pedal to get full regen. Using L solves this.
A big problem with driving in L around where I live (and I may be the only Spark EV owner in the state!) is that the brake lights come on every time I let off of the gas pedal. This shouldn't really be a problem because the car IS slowing down just as if I was using the brake pedal, however the drivers behind me get aggravated and start tailgating like crazy. I've even had a couple fly past me waving the middle finger while doing so.
Driving in D instead of L (mostly) solves this problem, but there are still a LOT of asshats here that I'm convinced are going to tailgate/honk/flip me off for no other reason than the fact that I'm driving an EV. And this happens while I'm doing 75 in a 60, and happens almost never while driving my wife's non-EV car in the same manner.
Plus I just find it easier to stay in D and coast more often, lightly using the brake pedal to maintain as much regen as possible without heating up the brake pads. I'm sure with enough discipline one could get the same results using either gear position, but meh.. whatever... I'm not THAT much of an MPG nazi!