+ summer tires with more PSI =
Now we're getting somewhere!
~60 km trip. Similar route & conditions as my trip home [though this one was a round trip; the 40 mpg trip home was 1-way, into a headwind].
But the mods need more modifying: the opening under the plate wasn't large enough to keep the cooling fan from cycling 5 or 6 times. And it wasn't even hot out! Low 20's C = low 70's F.