The closest petrol station on your way back to Debrecen Airport is about 2.5 miles away (or about 5min drive away). It's called MOL Toltoallomas and is located on Mikepércsi Road, a few yards before the turn onto the airport grounds. Always double-check your fuel policy in your rental agreement, as you should return a fair fuel car hire with a full tank otherwise you may see an unwelcome increase on your final bill. Search car hire on KAYAK