A new OEM pack was installed recently. Is there anything that needs to be "reset" using Techstream to tell the car that it is a new battery? (Apparently some cars have things like that for 12V swaps.) Our 2007 has a new pack as of a couple of weeks ago, and it didn't get driven much since. However, today I drove it from SoCal to the Bay Area. No problems, but the MPG was a little lower than the exact same trip (same speeds, same conditions) as last year. Based on the car's estimate, it is about 1 MPG less. Could be noise. Could be the lack of a reset if one was needed. Or it could be dozens of other things (a slightly dirty spark plug, slightly clogged injector, and so forth.) The car drove perfectly normally, and no battery issues whatsoever. The only thing that seemed odd was that on a flat road using cruise control no wind and no other vehicles nearby the "current mpg" would dance around rather a lot. Like up to 60 and down to 35. Never noticed that before. Could be that there was a slight undulation to the road though which I couldn't see but the car could detect.