I'm not sure if this has anything to do with Ford's decision, but when they redesigned the F-150 for the 2004 model year (I think it was 2004) one of the characteristics of the newer version was that it was substantially heavier than the previous one. I wonder if they've simply determined that the F-150 has a "weight problem" and they're acting accordingly.
Even with advances in engineering, that goal is daunting. The power required to move something as massive as an American vehicle (full-size trucks weigh between 7,500 and 12,000 pounds) at high speeds necessitates burning a little fuel.
Consider this: Many 2012 model motorcycles don't get 54.5 miles per gallon, according to www.totalmotorcycle.com. Even if they did, we doubt many families are willing to have mom and dad double up on a motorcycle and ride flying down the Interstate with junior riding the handlebars just to satisfy liberal notions of environmental progress.
This leaves auto manufacturers in a quandary. In response, Ford is trying to develop an F-150 truck with a largely aluminum body. "