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My theory was that if the car was faster, you'd be more tempted to drive it fast more often, hence worse MPG.
But if driven normally, standard vs a KV6 with JS manifolds and sports cat, would the economy be different.
ie, the engine wouldn't have to work as hard so would it be more efficient?
Or on the other hand maybe if it's making more power, it's using more fuel.
I guess without hard data, you'd just have to take a punt.
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