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Discussion Starter #1 (Edited)
Strange thing, Monday morning woke up to a dead battery, since I was trying to go to work, I got jumped and when to mu local Sears for a Diehard battery. No time to find an Optima or something else. Its a nice big powerful Diehard and always had lick. Usually get 3 yrs plus in the SFLA heat co aired to 1.5-2.5 with other stock batteries.

Well, since the battery change, MPG is up from 12.1 to 16.9 MPG. Is that possible? Same driving conditions, etc.
 

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Perhaps unplugging the battery and resetting the computer did something when the system relearned your driving habits.
 

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Actual or displayed ? Before I had injectors replaced on my 2500 Cummins, the display would be 20. After the injectors 17, but the actual mileage never changed, same 19 average.

I can't believe a low battery would impact mileage, unless maybe the AC was causing more drag - but I think RoadiJeff may be correct if it is actual.
 

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There's a regulator that gives the PCM what it needs in terms of voltage and current. As long as the battery is working, you won't see a change. (sure - rebooting the system might restore normal programming)
 

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Discussion Starter #5
Its via the computer. Will see actual on next fill-up. But the computer has always been with .2-.8 with actual.
 
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