| Domain name | Date | Price | Broker |
| blue-efficiency.de | January 2008 | $ 8,750.00 USD | Sedo |
| blue-efficiency.ch | January 2009 | $ 4,935.00 USD | |
| blue-efficiency.at | January 2009 | $ 4,900.00 USD | Sedo |
| blueefficiency.at | January 2009 | $ 4,900.00 USD | Sedo |
| highefficiency.com | March 2015 | $ 3,600.00 USD | |
| maxefficiency.com | February 2012 | $ 3,088.00 USD | |
| efficiency.co.uk | February 2018 | $ 2,550.00 USD | Sedo |
| waterefficiency.net | April 2020 | $ 2,125.00 USD | GoDaddy auction |
| energyefficiencynews.com | December 2020 | $ 1,800.00 USD | GoDaddy auction |
| fuelefficiency.co.uk | September 2009 | $ 1,200.00 USD | AfterNIC |
| maximumefficiency.com | March 2018 | $ 900.00 USD | GoDaddy auction |
| floridaefficiency.com | December 2013 | $ 770.00 USD | GoDaddy |
| inenergyefficiency.com | February 2012 | $ 671.00 USD | GoDaddy |
| coefficiency.com | March 2019 | $ 526.00 USD | GoDaddy auction |
| efficiencykansas.com | August 2014 | $ 416.00 USD | GoDaddy |
| waterefficiency.net | March 2022 | $ 405.00 USD | GoDaddy auction |
| travelefficiency.com | June 2021 | $ 362.00 USD | GoDaddy auction |
| efficiencycities.org | January 2023 | $ 355.00 USD | GoDaddy auction |
| efficiency.xyz | September 2024 | $ 326.00 USD | GoDaddy auction |
| ecoefficiency.com | March 2019 | $ 318.00 USD | GoDaddy auction |
| efficiencyhacks.com | September 2021 | $ 315.00 USD | GoDaddy auction |
| edefficiencyindex.com | September 2023 | $ 297.00 USD | GoDaddy auction |
| efficiencysolar.com | January 2023 | $ 295.00 USD | GoDaddy auction |
| maxefficiency.com | October 2016 | $ 293.00 USD | GoDaddy auction |
| efficiencymotorcars.com | November 2015 | $ 255.00 USD | GoDaddy auction |
|
| fuelefficiency.org | August 2023 | $ 212.00 USD | GoDaddy auction |
| edefficiencyindex.com | September 2017 | $ 205.00 USD | GoDaddy auction |
| totalefficiency.com | January 2017 | $ 181.00 USD | GoDaddy auction |
| neuralefficiency.com | May 2016 | $ 152.00 USD | GoDaddy auction |
| efficiencycapital.com | May 2019 | $ 128.00 USD | GoDaddy auction |
| smartefficiency.com | January 2018 | $ 119.00 USD | Dynadot |
| efficiencyaudit.com | February 2021 | $ 104.00 USD | GoDaddy auction |
| highefficiencydenver.com | May 2022 | $ 104.00 USD | GoDaddy auction |
| personalefficiency.com | November 2014 | $ 99.00 USD | GoDaddy |
| personalefficiency.com | November 2015 | $ 96.00 USD | GoDaddy auction |
| highefficiencyheaters.com | July 2018 | $ 95.00 USD | GoDaddy auction |
| smartefficiency.com | January 2017 | $ 89.00 USD | Dynadot |
| efficiencyarts.com | February 2014 | $ 87.00 USD | GoDaddy |
| recyclingefficiency.com | April 2015 | $ 80.00 USD | GoDaddy |
| 1001-home-efficiency-tips.com | August 2019 | $ 77.00 USD | GoDaddy auction |
| dentalefficiency.com | May 2016 | $ 75.00 USD | GoDaddy auction |
| efficiencylaw.com | October 2014 | $ 75.00 USD | GoDaddy |
| efficiencyhub.com | July 2023 | $ 74.00 USD | GoDaddy auction |
| animalefficiency.com | January 2019 | $ 65.00 USD | GoDaddy auction |
| efficiencyconsultancy.com | October 2021 | $ 62.00 USD | GoDaddy auction |
| workefficiency.com | May 2014 | $ 60.00 USD | GoDaddy |
| medicalefficiency.com | October 2021 | $ 57.00 USD | GoDaddy auction |
| efficiencypros.org | May 2014 | $ 55.00 USD | GoDaddy |
| efficiencyresearch.com | October 2020 | $ 42.00 USD | GoDaddy auction |
| increasefuelefficiency.com | March 2014 | $ 38.00 USD | GoDaddy |
|
| efficiencypros.org | May 2016 | $ 35.00 USD | GoDaddy auction |
| itefficiency.com | September 2018 | $ 32.00 USD | GoDaddy auction |
| public-efficiency.com | July 2024 | $ 30.00 USD | GoDaddy auction |
| smartefficiency.com | January 2022 | $ 22.00 USD | GoDaddy auction |
| theefficiencytheory.com | November 2021 | $ 22.00 USD | GoDaddy auction |
| efficiencyadvertising.com | February 2023 | $ 17.00 USD | GoDaddy auction |
| focusedefficiency.com | October 2014 | $ 17.00 USD | GoDaddy |
| airportefficiency.com | March 2018 | $ 15.00 USD | GoDaddy auction |
| blueefficiency.com | April 2017 | $ 15.00 USD | GoDaddy auction |
| economicefficiency.net | July 2017 | $ 15.00 USD | GoDaddy auction |
| energyefficiencyusa.com | January 2018 | $ 15.00 USD | GoDaddy auction |
| globalefficiency.com | April 2019 | $ 15.00 USD | GoDaddy auction |
| marijuanaefficiency.com | December 2018 | $ 15.00 USD | GoDaddy auction |
| sellingenergyefficiency.com | April 2016 | $ 15.00 USD | GoDaddy auction |
| theefficiencytheory.com | November 2020 | $ 15.00 USD | GoDaddy auction |
| workplaceefficiency.com | May 2019 | $ 15.00 USD | GoDaddy auction |
| efficiencysc.com | September 2016 | $ 12.99 USD | Dynadot |
| shipefficiencyreview.com | September 2020 | $ 12.99 USD | Dynadot |
| brainefficiency.com | January 2017 | $ 12.00 USD | GoDaddy auction |
| cloudefficiency.com | June 2023 | $ 12.00 USD | GoDaddy auction |
| efficiencyengagement.com | February 2021 | $ 12.00 USD | GoDaddy auction |
| efficiencyhvac.com | July 2019 | $ 12.00 USD | GoDaddy auction |
| efficiencys.com | April 2023 | $ 12.00 USD | GoDaddy auction |
| efficiencystandards.com | April 2020 | $ 12.00 USD | GoDaddy auction |
| efficiencysuites.com | May 2019 | $ 12.00 USD | GoDaddy auction |
|
| excellentefficiency.com | January 2022 | $ 12.00 USD | GoDaddy auction |
| fuel-efficiency-tips.com | January 2017 | $ 12.00 USD | GoDaddy auction |
| fuelefficiencyhelp.com | August 2014 | $ 12.00 USD | GoDaddy |
| onefficiency.com | August 2021 | $ 12.00 USD | GoDaddy auction |
| smartefficiency.com | January 2023 | $ 12.00 USD | GoDaddy auction |
| tax-efficiency.com | November 2017 | $ 12.00 USD | GoDaddy auction |
| 1efficiency.com | August 2022 | $ 10.00 USD | GoDaddy auction |
| dfwenergyefficiency.com | July 2014 | $ 10.00 USD | GoDaddy |
| dietefficiency.com | June 2018 | $ 10.00 USD | GoDaddy auction |
| efficiency.tv | August 2024 | $ 10.00 USD | GoDaddy auction |
| efficiencyadvantage.com | March 2018 | $ 10.00 USD | GoDaddy auction |
| efficiencyblueprint.com | September 2014 | $ 10.00 USD | GoDaddy |
| efficiencycoin.com | December 2018 | $ 10.00 USD | GoDaddy auction |
| efficiencyhotels.com | July 2014 | $ 10.00 USD | GoDaddy |
| efficiencysuites.com | May 2018 | $ 10.00 USD | GoDaddy auction |
| efficiencytechnologies.com | January 2014 | $ 10.00 USD | GoDaddy |
| efficiencyventures.com | February 2014 | $ 10.00 USD | GoDaddy |
| efficiencywork.com | March 2018 | $ 10.00 USD | GoDaddy auction |
| globalenergyefficiency.net | August 2017 | $ 10.00 USD | GoDaddy auction |
| golfefficiency.com | August 2018 | $ 10.00 USD | GoDaddy auction |
| highefficiencyfurnacefilters.com | November 2014 | $ 10.00 USD | GoDaddy |
| highefficiencywaterheater.com | August 2022 | $ 10.00 USD | GoDaddy auction |
| inefficiencymedia.com | January 2023 | $ 10.00 USD | GoDaddy auction |
| lifefficiency.com | March 2014 | $ 10.00 USD | GoDaddy |
| mefficiency.com | March 2018 | $ 10.00 USD | GoDaddy auction |
|
Total price amount in this set of 100 domain name sales is 47,464.98 USD; average price is 474.65 USD.
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