A blinker not functioning is the higher priority. That can be dangerous.
I noticed a lot of the responders mentioned similar issues with the gas tank issue. Not sure exactly what your parking set up is, but in our house, he has a car and I have a car. Sure, occasionally I will drive his for some reason or he will drive mine (usually only if we are ALL going somewhere as a family, so I am in the car also). But I am responsible for "mine" and he is for "his". I am a lot less tolerant of having a low fuel gauge than my husband is, so I keep it where I am happy and don't let it run below that. On the rare occasion that we are returning home from something and the gas tank is getting on the "low side", I will mention it to hubby at some point during our outing and we will stop before we get home to fill up.
I would go insane if I never knew which vehicle I would be driving the next day. I keep "my stuff" (sunglasses, gum, phone charger, etc) in "my" car, and hubby keeps "his stuff" (sunglasses, ID badge for work, gum, phone charger, ball cap, golf stuff, CDs, etc) in "his" car. Our kids always ride with me--that's part of my "job" to ferry them around to all their stuff---- so they keep their "stuff" (karate gear, car charger for DS's, tissues for son with allergies, sunglasses, karate gear, etc), in "my" car, too.
I also check the garage/driveway before I go to bed (when I take the dog out) to make sure nothing is blocking getting out the next morning....