Hi Rich,
No, I've been ecodriving on the same commute for 7 months or so, and the most recent increase due to adding the homemade zigzag Gorilla tape at the top of the windshield seems to be helping quite a bit. On this morning's commute, I added a further 0.5mpg to the average for the tank; so in ~140 miles out of ~370 miles, I went from 43.6mpg to 45.6mpg.
The weather has been cooler in general, and there has been some rain, and that's what I attribute the overall drop from my best FE this summer. During this tankful, the weather has been pretty consistent, and the 2mpg increase has happened since I added the zigzag tape at the top of the windshield.
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