I was worried about this for a bit, because "UNLEADED 88" was set apart from the other grades as if it might contaminate them (or be contaminated by them), and yet it was
cheaper than the 87 octane "regular" (presumably also unleaded) which was
more expensive (by a few pennies), implying that you might not want to use it even if you're just trying to save money -- but
Daisy seemed to have no trouble with it.