so is this true? mpg saver trick

so the other day my buddy was riding in my car and i had the heater on in my car and he said whitch ive herd before i started driving so i completely forgot but. he said ur ac use while ur driving takes up more gas then driving with out it on i drove with it on constantly also i tried it it almost seemed like it worked but i could just be excited

anyone know if this trick alctually works?
Author: admin