In city driving, nope, never. Every time I tried to outsmart the traffic route wise, I ended up with an higher fuel consumption and more wasted time. What's worked best for me it to take the shortest route and manage how I deal with the traffic as best as I can.
In interurban driving though, I often tell my mapping software to pull me an itinerary excluding highways. I always have lower fuel consumption when I avoid highways. Not only is FE higher, but the trip is often a percent or two shorter. However, average speed for the trip is significantly lower, which often makes a 2:30 hours highway trip between Quebec and Montreal into a 4 hours scenic route joyride.
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