Calculations also include: 1.035 miles/month based on 12.416 miles per vehicle year, Highway Statistics 2000, fhwa.dot.gov; median efficiency of 2021 model year EVs is 103 mpge or 3.1 miles/kWh, fueleconomy.gov; median 23.6 miles/gallon fuel economy for model year 2021 internal combustion engine vehicles, epa.gov.