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2017 Kia Sportage SX-GDI
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11 Posts
Discussion Starter · #1 ·
Purchased a 2017 SX TGDI last year with 32K miles. This weekend I replaced the battery, resetting the ECU in the process I assume.

Whereas the car was always trigger happy on the accelerator and punchier and only managing ~21MPG, it's now much smoother on the accelerator and I'm hitting ~26MPG on the highway now.
Car always driver in Normal or ECO mode.

Any idea why such a drastic change? I know there's a learning period after and ECU reset, but this is drastic. I'm not complaining about the better fuel economy and easier accelerator, but I didn't expect this. Makes me question if the previous owner changed some ECU settings for performance or something...
 

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2020 Sorento SX, 3.3L AWD
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619 Posts
I would guess that something in the ECU stored data was causing the lousy mileage. I'd just smile and bank the savings. :)
 

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2016 Rio SX Hatch
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399 Posts
Replaced the battery in my wife's 2017 EX a few months back, and can't say I've noticed anything.
 

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2017 Sportage SX AWD / Mineral silver with beige interior
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1,083 Posts
Replaced the battery in my wife's 2017 EX a few months back, and can't say I've noticed anything.
No difference with my battery change and I'm glad. My 2017 SX still kicks A$$
 
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