Thats is the reason I disconnected the bty, after 4 days of driving and filling up twice due to the amount of driving I did, I saw no change at all ( Computer or how many K's I was getting per tank) I don't completely trust the computer with how much MPG i'm getting but when the number didn't change I though I'd try it and it seems to work, same drive after disconnecting I got almost 100K's more. Now that fishing is open I will be going to the cabin every weekend and I'll see how much k's I am still getting to a full tank.
While looking at the MPG is not a modivational poster it doesn't matter when I pass 3 stuck Toyotas stuck, yes 3 and just drive around them to get to my fishing holes, it worth every $/gallon