I saw this in the Model S thread and I'm sure many of you have already seen this. Major thanks to @blincoln for putting this together. See his original post below and click on the link to plan your Model 3 trip! This personally helped me decide I wanted to spring for the larger battery as well.
A Better Routeplanner
A Better Routeplanner
As a new Model S owner, I felt the need of a route planner for my Tesla which helped me plan my long trips using Superchargers. The in-car planner has its issues and many other sites did not fit my specific Tesla needs either.
So, I hacked up A Better Routeplanner (which was a lot of fun). It works both off-car in your computer and phone as well as in the car browser. It will even follow your car as you drive and follow-up the consumption.
Try it out and see if you find it useful.