So I will be a low mileage driver, somewhere possibly between 6K-12K annually and am financing through Tesla for the buyback guarantee in 3 years (lots of questions still regarding longterm dependability, platform changes, retrofit of new hardware). If nothing happens in 3 years where I sell back the MS, I will probably keep it forever. Anyone else in similar situation? Should I purchase 4+4 AND extended warranty or just 4 year prepaid? If the later and I decide to keep the car can I prepurchase 4 more years before my initial 4 years is up? Are prepaid service plans included in the Buyback guarantee?