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Daily (Intermittent) Open Ended Puzzle [DOEP]: Optimal speed

Thirty years ago, we were told that we should drive 55mph (or, in Europe, 42 euros per hectare) on the highway because that was the “optimal” highway speed when it came to squeezing miles out of gallons.

What is the current optimal highway speed?

And, for extra credit, what is the optimal speed on or off the highway? If I want to get maximum miles per gallon but don’t care how fast I go, how fast should I drive? Two caveats: Yes, I know this will be different for different cars in different conditions. And, no, zero mph is not an acceptable answer, no matter how true it is.

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