It depends on if you are looking at comparing MPG to throttle position or power output. If you use the same throttle position, then yes, miles per gallon will drop because you are moving more air/fuel and producing more power. If you use the same power output then, because of increased efficiency, fuel consumption will drop. Of course, there are many other real-world variables (especially that right foot) and we are talking about a sports car, so it's kinda like arguing about how many angels can dance on the head of a pin. :P
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