Thanks for the info, guys. I can be very picky about my cars and how they are treated, and having one of them lent to other people and not really knowing how it was driven plus this issue of running it dry just got me all crazy concerned, hence my irritation. I could have said no when my sister asked if she could use my car, but I wouldn't feel right. Besides, this was my first time to meet my BIL, and I wanted him and my sister to enjoy their stay here.