Efficiency assessments are guided by EPA standards, factoring in 45% highway and 55% city driving for 10,000 annual miles. Costs are based on national averages: $3.90 per gallon of gasoline and $0.16 per kWh for electricity. Actual savings may vary due to market changes and driving conditions. Consumption ratings are provided for both electric vehicles (in kWh/100mi) and gasoline vehicles (in MPG).