[DFCH-Andy]

If you head to the Avis website you can retrieve your receipt. Does it mention the fuel service option on there.. If it quotes $9.99 a gallon it means they've had to refuel the vehicle (allegedly). If it quotes a much lower rate of circa $3, then the prepaid fuel was added on at the start. You will have signed the screen agreeing to the prepaid fuel charge so could have returned the vehicle back empty. Worth questioning them on it. When it happens with Alamo they've always been happy to refund... Budget/Avis is another story though.