CPO ISSUES
1. Mileage : Our CPO 85 came with more than 30000 miles on it (57000 km) and the motor and battery were in great shape. Our car charges to 97+% of original capacity, so mileage is not really an issue in terms of car performance/stability/range IMHO.
2. Wear/tear : Buying a service loaner can be a bit different than a former leased car (like our CPO was). A service loaner would be changing hands constantly, and likely not garaged. Let me be honest, when Tesla gave us a P85 loaner, I totally drove the **** out of it, no kidding. I wanted to see how a P85 handled compared to our regular 85, so I tore it up around corners and smoked the tires from stops. That said, given the 6 more years of warranty on drive train and battery you'll get on a CPO purchase of a 2013 car, you'd have nothing to worry about there. Besides, Tesla will give you new brakes and tires if you press them to, as that is what they've done for us.
3. Paint condition : Varies. Best case is a service loaner, as they generally aren't driven long distance on highways, mostly around town in the local service area. Plus, you know Tesla will have the full repair history (if any) on the car, unlike a customer car which could have been fixed at a body shop without reporting an accident. Look for models with the "paint armor" (clear wrap) option, as the hood and front area of the car should be well protected. It's not a full body wrap, just the nose/front. Sometimes this means the mirror caps have stone chips, but the rest of the car doesn't, just something to be aware of.
4. Price reductions : Check Hanks fine EV CPO app and look for cars that have had successive price drops likely due the car being on the market for many months, and so it reduces in price due to continued age and mileage. I've seen this on the loaner fleet here in Toronto, as I have watched their prices drop since they were put online 5 months ago.
5. Auto pilot (or lack thereof) : Having a CPO non-autopilot car myself, I can say that the one pedal driving is so much more relaxing and natural compared to driving a gas car that long distance driving is already excellent in a Tesla even without auto pilot. I drove 20 hours (two 10 hour days) from Toronto to New York and back with 4 people and luggage in the car, and it's a total road champ, so smooth, powerful and quiet.
6. Build quality : The higher the VIN, the better the sound insulation and interior fit/finish, the newer and more revised battery and charging systems will be.
7. Early "A" battery pack : Any car older than VIN 12xxx will have "A" revision battery pack, which takes 5 minutes longer at the supercharger compared to newer car. Not compelling for us, we have a 06xxx VIN car that we love, but you should be aware of this.
8. "P" or "D" : Any Tesla is a great car. Believe me, we test drove the P85 and loved it, but purchased an 85 right now to get into a Tesla first, and then see how the market for CPO evolves over the next few years. With 300+HP, the 85 was plenty for us. However, dual motors is a very very compelling feature.
OPTIONS
1. Dual chargers are handy for road trips, and for quick charging at home, but otherwise not a compelling feature.
2. Pano. Just get it. Much better for head room.
3. Air suspension. We needed it due to our driveway. Coil is tighter, and cheaper.
4. High fi audio. Must have. Huge benefit. Wouldn't buy without this option.
5. Tech package is a must. Obviously.