Quote:
Originally Posted by RedDevil
I took my car this sunny morning to my inlaws, a 140 km journey.
What mystery factor can suddenly improve my economy by that much?
No mystery really, it was the wind. I had a 4 Bft head wind this morning and a tail wind this evening. Just the wind can have this big an impact even while all other factors are adverse.
Even though logic seems to validate your story, it isn't proof unless you can rule out wind and all other circumstantial factors, an impossibility in real world conditions.
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Our winter Texans drive large 5th wheels or motorhomes from the north down to Texas in December and back home in March. They watch the weather closely when it gets time to return because they've found a tailwind saves them many dollars in gas on the return trip. They'll even stop a night on the way back to wait for the wind to change.