So this weekend, I took my wife's 07 edgeSEL AWD in for oil service at around 50k miles. While there, they tested the battery and warned me it was nearing the end of its life. The stock motorcraft battery had always had a large build up of acid on both posts, but i never did anything about it. I quickly learned this weekend that the acid had actually fused the positive terminal to the post. After some gentle persuasion (a.k.a. a hammer, chisel, screwdriver, pry bar, etc.) and a replaced battery terminal, i managed to get the new battery in place. Now today I drove it to work (roughly 40 miles each way) and noticed that the computer seems to be reading the fuel economy very erratically. Started my trip at 20.5 mpg and quickly dropped to 19.4 in the first few miles of my trip. got as low as 18.1 throughout the day and night of driving it. Sitting in a drive through idling and it changed 0.2 mpg in two minutes. I definitelt drive with a heavy foot, but i have nevered noticed it change this quickly. Similarly, the avg mph also started out at around 54 mph which seemed very high this morning, but eventually tapered back down the 34 throughout the day. I did perform the fuel trimming procedure to "relearn" the computer as specified in the owners manual. Not sure if this is all related or not. not sure if i have done something wrong??!?!!? please help
