There are emergencies and then there are EMERGENCIES. We have a couple stoves and oil lamps that are only used during emergencies, short term power outages and the like. Inconvenient, but good short term practice for a real EMERGENCY.

As for testing a 72 hour or BOB, use that kit as intended. Are we talking a 72 hour kit and a BOB as two separate kits or are they one and the same? Assuming they are different kits, use one for 72 hours in a controlled test and with the BOB, go to your Bug-Out destination. If you do not have a Bug-Out destination, why are you bugging out?

My Bug-Out bag is a truck and it contains my 96 hour kit. If I can't drive, I'm likely not bugging out.