Do I have to pay for it? If not, I'll go with some of that $100 a gallon stuff.
regardless - pretty much every vehicle on the road will run on 5/30 in any flavor. Vehicles that call for 20 will run it, as will vehicles that call for a 40, and though I'd hate to have to run it in a supercharged 800hp whatever, I would. Why would I hate it, because I'd be wishing I'd picked a 5/40.