Just got a new battery for my 3-year-old Taurus. Now, all of a sudden, the mileage (per the digital display) varies constantly as I drive and the "miles to go" is far lower than it should be. It drops as the weather gets colder, but not this drastically!
The mileage read-out used to change gradually throughout the year... 27.4 mpg or so in summer, working its way down to 23.6 mpg or so in the coldest part of winter. But it never fluctuated wildly over the course of one
30-mile trip, continually readjusting up and down hills. It's as if the new battery has given the display superpower and made it reactive to every little change in driving conditions.What's going on? Did the battery installer at Mills Fleet Farm screw something up?