I've been thinking long term about this.
Ford has already come out w the ability to shut down parts of your vehicle if you miss payments. No ac, no radio etc. I have a 2008 Tahoe parked in my driveway that runs and a Chevy pick up which is what I drive daily. I think I may find or fabricate a 1000 gallon tank and keep it at my house. I can make it for 2k and fill it for 3k. But that'd be enough fuel to last me a year if I couldn't get fuel from a pump.
I absolutely believe you'll see gasoline refineries as the next target besides just sabotage explosions.