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2 weeks ago I had a new Battery fitted. Now,  my "Since refuelling" MPG for the 2 full tanks I've used since is 30.9 mpg, and has gone into the low 31's for a few days. I was getting a steady high 28 - low 29 mpg for each tank full in the previous months. I suspect removing the Battery has reset the ecu and gearbox control unit, meaning the car has learned how I drive and adapted better from scratch (I bought the car with 18 k miles on it).

Does this sound right? I seem to remember the auto box adapts to driving style (or at least it did i the IS250)

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