Wifey's 2013 v6 base hase 21xxx miles on it. Over the last week or so the MPG has seriously take a dive. Oil changed every 5k miles with Ford filter and Rotella oil. Currentl at 50% life. Wife drives like an old lady. Was getting around 19-21 in town, now 15-17. Checked the tire pressure- fine. Replaced a dirty air filter. Use only top tier gas. Dumped a bottle of Techron in the tank. I've read some threads that is is a problem with 2013 v6 automatics but the car never was this bad. The onboard mpg goes as low as 12-13 mpg when idling and is now consistently 3-5 mpg lower than what it was. I've heard that disconnecting the battery for an hour will reset the EEC and that had worked sometimes. Car is still under warranty to I'll take it in and let them run some diagnostics. Anyone else with this problem?