The benefit of aero mods that I like is that no matter how much effort you are putting into hypermiling, you always get the aero "bonus". Right now I am able to Pulse to a speed 5 MPH lower (55 instead of 60) going down a hill and still be at a higher MPH at the end of my EOC.( I don't EOC much on the freeway part of my commute).
That tells me that aero is always my friend no matter my effort or the weather!
Maybe once the pure fun of being able to get 80 MPG at 55 on the freeway and 45 or 50 on the country roads wears off, I will step it up 5 MPH, maybe.
I totally understand that if I wasn't retired and don't need to be at the shop at a certain time, I would probably speed it up to the speed limit all the time.
When I was making this commute in my pickup at the speed limit, it would take about one hour and 5 minutes one way (54 miles). Now it takes me about one hour 25 minutes. I hope all of you can take an extra 40 minutes a day to have this much fun when you retire.