I just took a 2400 mile trip during the holiday. My longest sprint was ten hours. No, I didn't shut the car off when I filled up. There's really no reason to. If something's going to catch fire with it on, it will with the motor off. Hell, the car is still hot. When I stopped for lunch, I just jammed out on a tune, then shut the car off. I'm not in that big of a hurry. As far as a turbo timer goes...why? There must be 100 threads here about installation issues, locking the doors, leaving it in gear, alarm incompatibility...etc. Here's an idea...wait a minute!
Anyhow, I had no problems. No cel light, didn't blow up and got 36mpg on the highway. Have Fun!