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Testing info/data added to post#2.
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What prompted me to do this test was a pair of recent highways trips (the same trip, repeated on 2 weekends) to visit friends at a cottage.
It's 293 km (182 mi.) round trip, on secondary roads with a max posted limit of 80 km/h (50 mph). It includes passing through a number of small towns and one small city.
The first time I did the trip before the mods were all in place. My goal was simply to drive with load to keep the car in lean burn at ~100 mpg on the instant display, or higher when at the posted speed limit. I got something like 89 mpg US for the first round trip.
The second trip, in nearly identical weather conditions with all the mods in place, I used the same techniques (~100 mpg target), but I managed to do the trip in 20 minutes less! How? Because the car spent more time going faster on the highway while still maintaining at least 100 mpg indicated. And there was quite a bit more traffic (stop & go) in the city portion of the second trip.
And I ended up with 94 mpg US for the second round trip.
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