For the 2010 model year, the Mariner added Ford's MyKey and trailer sway controls as standard on all trim levels. The Mariner engine has a Flex-Fuel option on all of them which features being able to use E85 fuel and/or regular unleaded only on the optional V6 engine. Ford has also done away with the Euro-style turn signal repeaters for this model year.This version of the Mariner will be its last