Scoring Tenth Out Of Ten

(I was having issues with my siblings not chipping into petrol costs, so I used to deliberately run it down once a month to force my brother to chip in. One day, he had to chip in to see himself home, the next day this happens:)

Brother: “What happened to the petrol I put in the car!?”

Me: “How much did you put into it?”

Brother: “£5 worth.”

Me: “It costs me £50 to fill the tank! You’re not going to get far on something that meager!”

(I’m so glad I moved out and don’t share a car with him anymore.)