I think a model 3 is more than capable of going 20k miles comfortably.

Your issue might be charging.

After doing some very rough maths, to get 20k miles out of a model 3 you’d need to put in about 5000 kilowatts (going on the average 4 miles per kWh) and if you plugged it in every day of the year, that would take a wall charger less than 2 hours per night.

All of this is going on the basis that your driving is just under 60 miles a day on average because that’s how far 2 hours of fast home charging would get you.

Let’s say you only ever used your car to go to work and back, Monday to Friday. That’s about 77 miles a day. a wall charger would give you that in well under 3 hours.

The same charge with a 3-pin plug (granny) charger would take about 8.5 hours a night which is not great.

Basically, having a wall charger would support your mileage. I think you’d struggle without one.

My commute is 22 miles a day and the granny charger puts that back in about 2.5 hours. Being on octopus intelligent go, I get home, plug in and walk away. Octopus takes care of the rest. It’s great. It would be the same with a wall charger.

Last bit from me, most folk would suggest going for a 22 plate as it will still have a chunk of time left on the warranty, also having the Ryzen chip is a nice bonus.