I run my tires at about 40psi. I inflate them (Pirelli snows in the Winter) to 42 before a cold snap, then leave them alone, as the cold bothers my hands. I suggest this to anyone running the Ecopias or similar medium-quality tires. 36psi is too low for the Leaf. I also suggest grille blocking for any prolonged Winter driving, especially if there is no heat pump (although it helps the heat pump as well). I also use Eco mode (with the air control set to recirculate as much as possible) to reduce the heater output, and increase throttle control, any time I have any worries about range. The figures I gave above are for single-trip driving; 'stop and go and wait' driving really reduces range, to about 40 miles.