Aluminum's not the only thing putting the 2015 Ford F-150 on a diet. The company says a greater proportion of "high-strength" steel in the frame, increasing from 22% to 77%, will let them drop 60 pounds out of the frame while improving rigidity.
Metalsa, which makes frames for many passenger and commercial vehicles, is Ford's frame supplier for the F-150. They use what's called "tailor-rolled blanks;" sheets of metal that can be shaped in varying thickness, to reduce material usage.
Comparisons aside, 60 pounds isn't huge but it's certainly not negligible. The substantial weight reduction the 2015 Ford F-150 is receiving all around should help improve every aspect of the vehicle's performance, can't wait to see those MPG estimates.