Should i start paying for my own gas?

I am a 17 year old kid that has a summer job on a farm. i have a truck that gets like 15 mpg. I on average fill it up 1.5 to 2 weeks. I have no reason to save my money, im getting a settlement when im 18 from a car accident which will be easily over 20k. i think a good thing is i pay for my gas and parents pay for everything. but they dont complain bout gas soooo