Media,
I would suggest when one is engaged in the business of killing people and breaking things....depletion of fossil fuel reserves is way down on the list of priorities. Return on investment is an accounting concept and does not have much merit when considering warfighting capabilities beyond making sure enough money gets spent to buy the most effective kit possible so that one can achieve mission success.
The Osprey is not the solution to this puzzle....enhanced 47's and 53's are.