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I'm considering going one size up in diameter tyre AND compesnating for ride height increase (aero). Where I live I can go up 5% in rolling diameter without having to have low volume certification for the mods.
I suspect this may work to reduce MPGs because I have an automatic, bascially it means the road speed of all shift points are raised.
So thats the question, should an automatic get some gains in a taller final drive outside of TC overdrive lockup?
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