show label text of select option rather than its value in cmb2

I’m using the $gas example variable from your question in my answer below. Sorry for the bad formatting, I’m typing this on my mobile device.

If you’re certain that $gas will always contain a post ID then the simplest solution is to just do echo ! empty($gas) ? get_the_title( $gas ) : ''; (Ternary operator used here)

Another way is to get the options in your template to a variable and access the resulting associative array with $gas as the key to get the corresponding array value (label in this case).

$options = get_gas_options('fleettype'); echo $options[ $gas ] ?? ''; (null coalescing operator used here).

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