GroupValue

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'group_value',
		'value'   => '7.2',
		'compare' => 'LIKE',
	),
	array(
		'key'     => 'group_value',
		'value'   => '8.6',
		'compare' => 'LIKE',
	),
);