Again, as I alluded to, there are a number of different technologies. There are also different applications that they'll be used in. Compressed natural gas, for example, in comparison to propane, has range issues. That doesn't necessarily affect Canada Post in a lot of its 50-kilometre routes. But if someone is going to run a shuttle from one place to another, you need an awful lot of compressed natural gas on board to travel the same distances as you would with a different fuel. I'm just suggesting why we would use different fuels in different locations.
When you talk about putting all our eggs in one basket, you're right, as it wasn't that long ago that gas and diesel were only options and that we really didn't have a choice. But propane and natural gas resurged in the 2000s. I think we saw it maybe 20, 25 years ago. In the eighties, propane was rah-rah; everybody's on propane, and we were doing all these conversions. It was good for a couple of years and then it phased out. We lost some research and development and some other things.
So if we were to invest 100% of our fleet into one of those technologies that's emerging today and then have it not be successful, we would be in a dangerous spot.