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I see some people suggesting that 18–19 mph with minimizing stopping is what maximizes efficiency:

https://www.reddit.com/r/prius/s/klltPluFdZ

So I suppose route planning is mainly about trying to find long stretches of back roads without too many intersections? I even wonder if you need a car ahead to report on stoplight timing, so you can accelerate or decelerate slightly to avoid stopping. Or to tell you when it's safe to barrel through stop signs, that nobody is coming in the other direction.



Oh interesting - so there's a time cost that isn't necessarily considered.


And distance. As the distance to get from A to B increases, mpg becomes less important of a metric than total fuel consumption.

(1 mile / 60 mpg)/(2 miles / 90 mpg) = 0.75

Traveling 1 mile @ 60 mpg consumes 75% of the fuel as going 2 miles @ 90 mpg does.

Edit: *Assuming the route planning grand-OP mentioned to optimize for mpg goes significantly out of the way.




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