Microsoft today continued to press its case that Windows 10’s Edge browser is more power efficient than rivals.

In a post to a company blog, Jason Weber, a director in the web platform team, trumpeted new streaming tests that show Edge displayed content longer than other browsers on identical battery-powered Surface Book laptops.

“With the Windows 10 Anniversary Update, Microsoft Edge is more efficient than ever, and still the best choice for extending your battery life on Windows 10,” said Weber.

According to Weber and his company’s tests, Edge streamed video 45% longer than Google’s Chrome before the notebook’s battery died. The blog cited a string of other measurements to bolster Microsoft’s claim that Edge is more power efficient than competitors like Chrome, Mozilla’s Firefox and Opera Software’s Opera. Microsoft also contended that the version of Edge bundled with this summer’s Anniversary Update — identified as 1607 to mark year and month — is an improvement over the edition packaged with last November’s 1511 Windows 10 update.

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