I just brought back from Chicago -Omaha-Chicago trip. All worked well. Just fueled up and noticed gas guage only reading 1/2 to 60% full. 220 miles to empty on digital readout. (Typically reads over 400miles). Also getting a beeping noise coming from Drivers side of engine. I pulled & replaced the pos. lead off battery & guage went to full, however beeping noise (similar to the submarine sonar beep you hear on an old war movie) continues.

Cars & Trucks - Mercury - Mariner - 2008 Mercury Mariner Hybrid