i know the owner manual says to not use any more than b5 but i couldn't help myself so i topped off my tank w the b20 today. before i was getting 11-12 mpg w my truck lifted 8'' w/ 38'' tires but since i filled up w the b20 ive been holding steady in the 16mpg range. has anybody else tried this and noticed a difference?

 

I filled up 3/4 of a tank with B20 while towing my 30' Weekend Warrior once. I've got a 6" lift and 37's (no gears yet); I got a wopping 4.6 mpg while towing