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Thanks for the update on your Mazda!
I've got a 2015 2.0L Mazda3 sedan that's been the most efficient car I've ever owned.
I haven't modified my car to gain any aerodynamic improvements, but I'm still able to get outstanding efficiency out of it. My Fuelly account shows a 44.8 MPG average over a 40,000 mile, 2015 - 2020 period, which comes from virtually all highway travels.
Unfortunately, the Virus from China has stopped almost all usage of my Mazda since 2020, so I stopped tracking the mileage. Sadly, my Mazda is mostly parked-in-place for now.
I noticed that your early posts indicated relatively high IATs with the grill blocks. I live in semi-tropical Louisiana, so the thought of blocking any cooling air has never occurred to me. In fact, I actually installed hood louvers to decrease under-hood temperatures. I did this because I suspected high temperatures killed my battery too early. With the hood louvers, I'm seeing both my IAT and overall engine-bay temperatures are at ambient when on the highway. In stop-and-go town traffic, temps rise above ambient, of course, but usually not by much.
Enjoyed reading about your Mazda. I love mine too. :-)
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