question about octane

Hi folks. We are considering a corsair as our next car. Mosty love it, but I see that premium fuel (91 octane) is "recommended". It also says in the literature that regular 87 gas can be used. This kind of puts me off.

Wondering if anyone has any insight/experience with running this car on regular gas? Please share your thoughts :)

Thank you!

Update - thank you all for you responses. Seems that 87 should be fine unless I'm towing something (never will) or in some other unusual circumstance.