So last week i broke down at a gas station. After spending 2 hours trying to figure out why my jeep would start, but would still turn over, i gave up. I had it towed to some place in Jersey since thats where i was. $700 later i get a new crank sensor and new ignition coil. Jeep now runs, great, but i went from 17 MPG to 8.5MPG on the highway. Can anyone tell me what would make this happen? It the 5.2 318 motor. I have manualy reset the compter and it went to 10, which still isn't normal.