2021 CX-5 CE Turbo - Premium gas required?

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You're going to get answers that are not related to the question you're asking, so the answer to your specific question about fuel economy is: no.

Assuming that ""right mileage" means fuel economy.

 

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Am I reading it wrong, or this illustration suggests that a car reaches EPA mpg at speeds 75-80mph?

Pick a line, the blue line. On the left side you have the fuel economy, miles per gallon. At the bottom you have car speed. Now, looking at the blue line, from left to right: you get more than 40 miles per gallon at 50 miles an hour speed. As you move to the right, to 75 miles an hour speed, the blue line intersects the 30 miles per gallon line which means that the fuel economy gets worse the faster you go.