The Oil Drum

I have to disagree. Possible ways to save oil by other transport methods are totally on-topic here. As the "About Us" page say:

This real and tangible crisis of supply and demand is now inevitable. Whether the coming crisis arrives in six months or in four years, whether the crisis arrives in a slow, secular fashion or as a cataclysmic "shock," our purpose is the same: we are here to raise awareness of the reality of the current problem and to attempt to address the real issues that are often hidden by political pandering.

We are here to talk about ideas. We're all learning here about ourselves and from each other. No perspective will be punished as long as evidence and logic are present. We want to bring brain power to bear on all of these issues; we may not come up with a solution...but we can at least say we tried.

What can be expected to happen as this crisis develops and unfolds? Stick around, because that's the kind of stuff that we're going to talk about.

"It will/won't work" is a legitimate debate (I'm pretty sceptical about this much tunneling myself). But "it's off topic" is clearly incorrect.