I have a 91 yj 2.5 with 31" bfg all terrains and 4" lift. I only get about 12 mpg. And to boot my speedo reads 55 at 50. Soo it's prolly more like 11 mpg. I'm not sure why It could be so thirsty. That's around town and highway miles. What can I do to get better milage.? And what can I do to fix my speedo/odometer?