Interesting, I have always just thrown burritos and stuff on my intake manifold to warm up when I’m driving. Started doing it like 15 years ago when I would go wheeling and just carried over to scouting trips/hunting trips. I know they make little cooker boxes for snowmobiles that use the engine to heat food too.Bought one of these for some of my hunting and scouting trips. Great for burritos and really anything wrapped in aluminum foil. Heats my food while I am driving and normally ready to eat when I pull over. Truckers have been using them for years. Big time saver for me when I don't have time to cook but want something hot to eat.