--------------------------------------------------------------------------------
gas_capacity=14
gas_pr=3.59
Prior to inserting a record in fillerup...
********************************************************************************
********************************************************************************
filled_up=12.3
********************************************************************************
*hashref:   $VAR1 = *::hashref;

$hashref:   $VAR1 = {
          'filled_up' => '12.3'
        };

%$hashref:  $VAR1 = 'filled_up';
$VAR2 = '12.3';

\%$hashref: $VAR1 = {
          'filled_up' => '12.3'
        };

\%hashref:  $VAR1 = {
          'gas_capacity' => 14,
          'gas_pr' => '3.59'
        };

\%fillme:  $VAR1 = {
          'gas_capacity' => 14,
          'gas_pr' => '3.59'
        };

--------------------------------------------------------------------------------
gas_capacity=14
gas_pr=3.59