I've owned my Mariner Hybrid for a little over two weeks, got 37mpg out of first tank, 34mpg with highway and city on second tank. Very impressed with this vehicle, love the Nav with Sync and Sirius. Mercury hit a home run with this one. Rides very nice, comfortable with loads of front leg room.
Gas mileage and nav system
Make it easier to run on battery, as soon as you put a little pressure on gas pedal it jumps to gas engine. It takes a soft touch.