Royal Caribbean's Symphony of the Seas isn't just bigger. It's more energy efficient, too - USA TODAY

Royal Caribbean's Symphony of the Seas isn't just bigger. It's more energy efficient, too - USA TODAY

USA TODAY

Royal Caribbean's Symphony of the Seas isn't just bigger. It's more energy efficient, too USA TODAY It's not just bigger. It's more energy efficient, too. Royal Caribbean's new Symphony of the Seas, the largest cruise ship ever built, sips 25% less fuel than Oasis of the Seas and Allure of the Seas — two slightly smaller sister vessels built in 2009 ... Royal Caribbean: 'Very Aggressive' on Tech InfrastructureCruise Industry News all 6 news articles »