“Microwaves are designed specifically for heating liquid (or the liquid contained within food). Its heat waves are not wasted on heating the air or container around your food. Microwaves use 1/3 less energy than the stove. Better yet, save even more on your electricity bill by using your gas BBQ to grill more meals!”
https://www.petro.com/resource-center/spring-summer-energy-saving-tips
