DAR

Since battery was replaced 3 weeks ago, I've driven over 500 miles (Road trip), and the bad mileage is continuing. Spent close to 1K on the maintenance, battery, and coil replacement.

I purchased my 2014 Ford Fusion SE Hybrid new in 2014. Never had a problem until this month. Had 99K miles on it and my 12 volt battery died. Trip to dealer where I purchased car. New battery plus I went ahead and did the 100K maintenance since it was in the shop. Now I am getting horrible mileage. I'm either 20 mpg or under or it goes to full electric. I used to be able to coast around town around 40 mpg per the display. Any idea what the problem could be? I had the coolant changed, new spark plug + 1 coil changed, and fuel injection service. So upset, car has 1 payment, and I love driving it with great mileage. Now I'm lucky if a get 30 mpg on a 10 mile trip (range before was anywhere from 45 - 60 mpg for same trip).