Form schelta singola con valore di default

[Alhazred]

<select name=limite>
<option value=0 <?php if($miavar == 0) echo "selected" ?>>benzina</option>
<option value=1 <?php if($miavar == 1) echo "selected" ?>>metano</option>
<option value=2 <?php if($miavar == 2) echo "selected" ?>>gpl</option>