Out of Gas

You see that you haven't got any food in the fridge so you decide to go to the supermarket. You take your car but unfortunately you forgot to fill up the gas tank so you run out of gas in the middle of nowhere. Luckily, there's a gas station right ahead of you. Although, there's one little problem: you haven't got the money to pay the gas so you decide to buy your groceries from the mini market and bring them home on foot... A logic-based story relying on vehicle energy.