Question about ground beef and fat content after cooking.

I always buy 80/20 or 85/15 ground beef to meal prep my lunches for the entire week. I'm trying to gain weight, so I'm focused on eating a lot of fat. However, the last time I cooked ground beef, a lot of its fat content rendered out. My question is, am I still consuming 15-20% fat even after cooking? I'm also trying to stick to a budget, so I'm unsure if I'm meeting my daily fat intake goals with ground beef.

Also, any recommendations for budget cuts or tips are welcome