The reliability rankings are based on the rate of breakdowns reported by surveys of Consumer Reports subscribers. It doesn't appear to be an index or functional

The reliability rankings are based on the rate of breakdowns reported by surveys of Consumer Reports subscribers. It doesn't appear to be an index or functional scheme in the way you're hinting at (100 points to Gryffindor for not needing an oil change!) > But reliability has been a weak spot for Tesla. According to our survey results, problems with the suspension, especially with the 2017 model year, have been an issue for the Model S luxury sedan, while hardware problems—especially concerning its unique falcon-wing doors—have plagued the Model X SUV (neither is currently recommended by CR). And now our latest survey data has surfaced numerous problems reported by Model 3 owners as well, which is why CR has removed its recommendation for the vehicle. And as it happens, CR do recognise that engine and powertrain problems are much rarer: > By contrast, CR members have reported few problems with Tesla’s unique electric powertrains, which may be due in part to their relative simplicity when compared with traditional internal-combustion engines https://www.consumerreports.org/car-reliability-owner-satisfaction/tesla-model-3-loses-cr-recommendation-over-reliability-issues/ https://www.consumerreports.org/car-reliability-owner-satisf...