A Honda owner recently discovered that using the recommended fuel in his vehicle might be easier said than done.

He pulled up to fill his tank, looked at the inside of his fuel door, looked back at the pump, and discovered a disconnect between what Honda recommends and what the gas station offers.

The label on TikTok creator @ztn_drives' fuel cap says 91 octane is recommended, with 87 as the minimum. The pump in front of him sells 87, 89, and 93—but no 91.

The video has racked up more than 774,000 views and inspired an engineering-heavy comment thread.

He framed the post as "question of the night."