Mileage loss is kinda hard to tell, because I got the tires right when we started switching over to winter gas. But they are heavier, 50 lbs vs my oem Bridgestones that were 40 lbs. I would say I lost 1.5 mpg.
They howl a little bit from 40-55mph. But then from 60-80, they actually quiet down and are only marginally louder than stock. It's mind boggling how they can run so quiet on the freeway with how aggressive the lugs are. I would buy them again 100%, and I am one who wouldn't be able to tolerate loud mud tires like Trail Grapplers.