I bought a 2018 Long Range RWD Model 3 in April 2018. I have fully charged the car 4 times. At 24,000 miles a 100% charge gave me the full advertised rated range of 325 miles (520 km). At 43,000 miles a full charge gave me 300 miles of rated range.
In October 2019 I went to New Mexico for 5 days of work. The trip to Albuquerque would have been about 1200 miles as the crow flies, but rather than fly I drove there in our Model 3. The full trip was 2,700 miles through 6 states. I used 17 Superchargers and paid $92.66. Driving electric reduced my emissions by over 70% compared to driving a car that gets 25 MPG (or burns 9.7L / 100km).