Actual efficiency improvements and benefits may vary based upon horsepower rating of replaced and replacement motor, performance characteristics of the replaced motor, hours of motor operation per year, actual cost of electricity and other factors. Benefits claimed are based on: Carbon Dioxide US Power Plant Emissions Output Rate for 2000 per US EPA "Clean Energy" http://www.epa.gov/cleanenergy/egrid; Average Annual Emissions (Carbon Dioxide) for Passenger Cars per http://www.epa.gov/otaq/consumer/f00013.htm; Emissions Reduction as Compared to Tree Plantings per http://www.epa.gov/appdstar/pdf/brochure.pdf.