That might be helpful in terms of the next question, as well.
One of the things that occurred to me was the used vehicle market. Obviously someone who would purchase a natural gas vehicle new, with the home refuelling, could maybe make the case that over the life cycle of the vehicle, if they had it for four to five years, it would come out positively for them. But for someone buying a used vehicle, it may not be such a positive outcome in terms of the cost, especially if they had to purchase the home refuelling station.
I'm wondering if there is any evidence out there on used vehicles. When someone is looking to resell a natural gas vehicle, are they taking a bit of a hit on what they're able to recover? Is it a very difficult market for selling a used vehicle with natural gas?