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Over 51,000+ miles I have averaged 32.65MPG, as documented in my owner's journal thread. An increase of 10 to 15% would mean an increase in mileage of 3.2 to 4.8MPG.
Given the current focus on fuel economy requirements, I just don't see any way that Toyota/Subaru would have left that on the table if a simple ROM change would have upped it, even if it meant sacrificing performance a bit particularly given that straight-line, top speed performance was not their focus with the 86 platform.
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Olivia 05/03/2012 - 01/06/2024. 231,146 glorious miles.
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