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In my experience, both on a Leaf and an e-Golf, the Bridgestone Ecopia tires are just about the lowest rolling resistance tires available today. The caveat is that I have driven the OEM version, only, and I think the retail version (Ecopia Plus?) has deeper tread, I think.
I typically inflate them to 42-44PSI, and they roll and roll and roll.
The Michelin tires on out Bolt EV are also really really low rolling resistance, and they have better grip, particularly in the winter.
The Leaf is not very good aerodynamically, and the Bolt EV is in theory worse, but I thing it is no worse, and possibly better than the Leaf. The e-Golf is the best of the three, but is not all that great.
Have you tried putting the Leaf in neutral, and coasting? If you hold in in N for ~2s - or put it in R - you can try coasting. Just don't use the R method below 7MPH - or you will go into reverse; instead of neutral!
This can help increase the efficiency, for sure.
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