Sorry about the confusion on that one! We should have put a little more in the way of tutorials for the game. It is winnable but you need to find 3 gas cans and bring them to the car one at a time. If you press f on the car with a gas can in your hands, it will remove it from your inventory and decrease the number you need. Once you interact with the car at 0 gas cans, you win. We probably should have put in a message saying you need a gas can when you try to interact with the car while you are empty-handed, oops.
Thanks for playing and glad you liked the idea too!