North Dakota, nicknames as "roughrider country" for its historic cowboy soldiers, also has a modern-day reputation for riding rough.

The state uses twice the amount of car-energy as Florida, according to a newly-released WalletHub's 2015 Most and Least Energy-Efficient States ranking.

The financial website collected data on car and home energy consumption in 48 U.S. states, excluding Alaska and Hawaii due to data limitations, to determine which states have the most energy-efficient daily practices. The 48 states received a score based on home-energy consumption per capita – 55 points – and vehicle miles driven and gas consumption -45 points. New York rose to the top of the list with a score of 93.36.

The list highlights the massive costs associated with energy to governments and residents, with the average American spending $2,000 a year on energy bills, according to the U.S. Energy Information Administration. A McKinsey & Company report finds that an estimated $520 billion investment in energy efficient measures on behalf of governments could save the economy upwards of $1.2 trillion in the potential reduction in greenhouse gas emissions.

Just in time for October's National Energy Awareness Month, take a look at which 10 states are regarded as the least-energy efficient in the country.

^{*Images courtesy of Wikipedia}

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