My take is this. He bought her the canoe. OK. He will do himself in the first time she 'wants' something and he cannot afford it.
Now, just because he bought her a canoe does NOT mean you have to lend him your car. It is not your problem.
Simple answer is No you can't borrow my car and change the subject.
He is not going to change. She is going to get mixed 'signals' for a while, and think that when she wants something that Mom doesn't jump right away and get, daddy will get it for her. She will learn. He will disappoint her. She is 17 and will now start learning some hard lessons of her own.
Keep working your program, the program you 'wished' he would work. Your daughter will see the difference.
J M H O
Love and hugs,