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But other than accessory losses, everything else is changing due to the increased engine speed.
I am not saying that a 5% increase in top speed means an exact 10% decrease in drag, there are too many variables at play to say absolutely. The error between measurements is perhaps 10%.
However you can say with absolute certainty that a fixed throttle position will give you a higher top speed if drag is reduced, there is no way you can argue against that.
At least a few mph difference, averaged over multiple readings, it can't all be down to the car suddenly becoming more fuel efficient or is that what you are saying?
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