It’s not the leveling kit that’s gonna get you, it’s the rubber. As soon as you get away from the P series car tires they come with that weigh like 40 lbs a piece and jump up into 50-60 lb a piece tire expect a 2 mpg drop minimum. Been there done that.
Ha - exactly my thoughts. I usually get around 15-16 mpg in a mix of highway and city driving with my 2008 5.7, but when I put on my winter/hunting tires (stock size G/Y Duratracs) I lose around 2 mpg instantly. If I remember correctly the G/Y's weigh about 15 lbs more than the P series Michelins.
