Sorry, I have to say it, but because bacon is not 100% fat, your mix will be slightly leaner than 80/20. Will it matter, probably not, but you are adding a little more meat also when using bacon. Bacon can vary from 10%-90% fat, so the higher amount of fat the bacon has, the closer you will be to your 80/20 mix.Store bought cured bacon! If my math is right wouldn't it be 4 lbs meat to 1lb bacon for a 80/20 mix?
I have started adding a TBS of Jeff's rub per 2 lbs of burger meat at the time I make up my patties. Gives it that extra kick and everyone loves it!