The tesla subreddit is really active:
https://reddit.com/r/teslamotors/
Seems like people on there are saying cold weather cuts down range by about 30%.
Your supercharger referral miles expire 6 months from your last referral, but referring another person bumps the deadline by another 6 months.
I was in the market for a Model 3 Performance, but once I realized the fed incentive only applied to the base model SR+, I just ended up getting that. Not regretting that decision at all. SR+ is more than fast enough for city driving, and the 386km range isn't an issue when you can charge in your building.
In fact, I did Calgary > Vancouver in 1 day (supercharged in Golden, Revy, Cranbrook, Hope), then did Vancouver to SF in one session (9am Vancouver departure, 5:30am +1day SF arrival). I think getting the Long Range might've let me skip a couple supercharging sessions, but now that I've had it in SF for a month I don't think I would notice the difference at all between SR+ and LR AWD.
I ended up getting a $108k cheque from insurance for my Macan GTS that got totalled (only paid $91k for it new last year
), could've gotten two SR+ Model 3s with it