I just put a 2” level kit on my 2015 F250 6.7. Also changed from stock rims & tires (Michelin tires 275/65R20) to TOYO Open County RT’s 35/12.5R20. Normally I would get 17.5 mpg HWY and 15.5 City. When I was pulling my boat I would get 10 mpg HWY. :(
Needless to say I have about 45k miles...