"Running out" and "cost-effective availability" are two different things though. There's a surprising (to me) interest in alternatives (in the context of this discussion an "alternative" is where you don't stick petrol in it) at the moment (the number of Teslas on the road for example - despite the price!). Was there a mandated removal of leaded petrol from service stations? Or was that a response to fewer & fewer people buying it? And delivery of ULP uses the same hardware/infrastructure as delivery of Leaded, if 95% of people go to servos to buy high-speed electricity or hydrogen or something, then a Ye Olde Petrol Bowser is going to be taking-up a lot of wasted real-estate. Have a look on CarSales for FPV GT-351's (I think that's what they're called), the last of the GT's. There are a couple of dealers who seem to think they'll get ~$120k for one! On the flipside, if even one of those does sell for anything near that, then the LS9 GTS-based HSV would actually be worth more than list-price within a year.