A fella in the next town over had a nice new house and terrific garage. He has a Propane BBQ grill in there and the obligatory beer fridge. The fire inspector figured the propane tanks leaked and when the fridge kicked in a spark was created.
Most of the garage end of the house was lost, including a new Chevy pick up and a pristine 1967 GTO he was getting ready for a parade. He had owned the GTO 25 years.
Just thought I would mention this and I know I won't be storing gas tanks inside and enclosed building.