I have a company vehicle and i get a fuel card for it too.. There's a chain of service stations that get my fuel from and they have a rewards points system. You get over 2000 points you get a $20 voucher.
I applied for a card and when i fill the truck i get points for every point over the first $30. When you fill your truck with 150 litres of fuel at a time those points accumulate quite quickly. I just recivced my first $20 voucher in the mail....
Off to buy something nice now