has allowed this to work and what makes it difficult for this to work in a company like pemex or saudi aramco or even exxon is that the entrepreneurial independents empower people at a significantly low level in the hierarchy, to make decisions about drilling and to experiment on drilling, and this enables the entrepreneurial companies to do things that others can't do. now, what has triggered this clearly was on the natural gas side, what's happening on natural gas is truly important, and cannot be ignored, because we look at the oil balances in north america, we have to think of where natural gas is going to by the end of this decade, almost certainly start displacing oil consumption. one of these, by the way, is in natural gas vehicles, and it's probably going to enfold pretty quickly and probably in the heavyduty truck fleet, so i want to just make a note on this and we can talk about it later. the economics of converting the heavy truck fleet from deez toll natural gas are compelling. it costs about $7,000 to do the conversion without having a new rig, without having a new engine, and th