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  1. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    No deep sleep messages for me, and the indicated fuel economy is back to around 33-34 over the last 1.5 tanks

  2. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    I did it under the hood, through the manual-recommended jump points

  3. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    I haven't driven too much since the last update, but as the temperatures have dropped a little bit, the mpg has continued to climb back up towards previous levels. I'm currently sitting at ~34 mpg, which sounds about right for the type of driving/idling I've done recently

  4. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    Conveniently, this article just popped up: "The Environmental Protection Agency and Department of Energy says running your AC in high heat can reduce your fuel economy by as much as 25%. ... For a car that typically gets 30 miles to the gallon, that's like losing seven and a half miles."...

  5. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    I attached a battery tender yesterday evening and it was still charging after a few hours, so I left it overnight. Woke up with the charging done, so I took the Maverick for a short city drive, and I was seeing much better battery performance, even with the AC on max. 14:48 drive time, 37.4 mpg...

  6. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    Hmm, not a bad theory (bad 12v battery/connection draining the HV battery?). I'll try jumping it and/or changing the battery to see if it makes a difference

  7. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    No shaking, no weird noises, no performance impact, highway mpg is still consistent, and this has persisted through at least 2 different gas stations so far. It just seems like the HV battery is getting discharged much more quickly than before, so "battery time" has dropped significantly...

  8. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    Does AC have that much of an impact? I used to get 35-45 mpg around the neighborhood pretty easily, but now even when I turn the AC and radio off I get 28 if I'm lucky. Combined mpg since my last fillup is sitting at 19, and that's non-highway miles at <50mph

  9. High voltage battery not holding a charge? (Hybrid city mpg dropping)

    Hello all! I have ~3000 miles on my hybrid XLT, and over the last 2 tanks I've noticed that my city mpg has dropped significantly (from 35-45 to 18-25), even though weather conditions & driving style haven't changed much (90+ hot weather, tire pressure the same ~37 psi, city driving at ~45 mph...




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