official histories of, say, Desert Storm, or OIF I, and then trying to extrapolate fuel requirements from them? I think, also, OIF I's official history has a footnote on the Red Ball Express (I think Van Creveld also references it as an example of diminishing returns at the end of his book on logistics). You might also want to look at Pagonis, "Moving Mountains" (I think that's what it's called).

Thanks
Jeff