Well I'm not sure how acurate my mpg meter is in my lariet but b4 I tuned the engine with the edge evolution tuner i was getting 15.5 to 16 mpg average. Now I'm doing 25 mpg acorrding to the meter. still waiting to fuel again to get a more acurate avg. I do have a bed cap on mine though. I'll let you know when i refuel what i'm doing