I took a short trip this week and reset the ol lie o meter and was wathing it in the Ex. When I was at a steady 57ish the meter was reading 20.5. When I sped up on the interstate to 68ish it dropped to 16.5. Now Im not saying these are 100% accurate but with my chip on and then the speedo not recalibrated for the bigger tires it has been farily close to actual mpg. Anyone else notice that BIG of a change in that 10mph? Cause thats HUGE! I knew it would be less but never thought that much. Has anyone done an actual test at a constat 55-60 on a whole tank on a lifted truck to see if my meter is close?