The ALL-AROUND PERFORMANCE SCORE assesses the combined Social, Environmental and Economic Performance scores to distinguish the vehicle that is the top performer in all three realms when compared with others in its class.

The Automotive Performance Inde (API) is where all indicators in The Standard – Environmental Performance Indicators, Social Performance Indicators and Economic Performance Indicators – are merged and expressed in statistical terms. The merging of qualitative data with quantitative data in the API ensures all meaningful considerations are adequately represented to ensure an environmentally, socially and economically balanced all-around vehicle assessment.

There has been wide generalization regarding the environmental costs and benefits of hybrid, plug-in hybrid electric (PHEV) and electric vehicles (EV). The API cuts through these broad claims and focuses on each technology as it is implemented in each model year 2018 automobile available in the North American market.



The API applies statistical methods to demonstrate each vehicle rating in relative comparison. For example, the vehicle that performs highest in environment performance in a given class obtains a rating score of 100. Each vehicle in its class is then compared relative to the top-performing vehicle with a rating score reflecting the statistical difference in performance outcomes. A score of 91 translates to a 9% environmental performance deficit as compared to the top-performing vehicle.  

Due to the API’s relative vehicle rating method, vehicle class divisions were identified as a critical input, these class divisions are discussed earlier in this Study; see the Vehicle Class Division section.

While the Automotive Performance Index is indeed an exhaustive list of vehicles to trim level detail, with each vehicle assessment reporting over 200 unique data outputs (the culmination of thousands of data inputs), ASG has taken additional measures to ease the burden of sorting through all data points and all vehicle assessments. We have developed key performance categories and sorted all vehicles in each class according to Environmental Performance, Social Performance, Economic Performance and All-Around Performance. The vehicle in each class with the best score in each unique category is named the performance award winner (i.e. Best Environmental Performance Award winner). The vehicle in each class that scores highest combined scores in Environmental Performance, Social Performance and Economic Performance is named the ASG Best All-Around Performance Award winner.

One step further, we also name the Best 5 All-Around Performance Award winners in each class to provide consumers with a concise product comparison guide.