True about the aerodynamics- I've been having to make a 400 mile round trip almost weekly lately.
65MPH my diesel shows around 19-20 MPG for the trip.. 75MPH it shows about 15-16 MPG!
Huge difference for what amounts to a 25 min savings for one way...IOW an extra 2.5 gallons of fuel per 200 mile leg at $2.50 per gallon = $6.25 to get there 25 minutes sooner on a 3+ hr trip!
I'm retired and usually not in that big of a hurry- heck that $6.25 will buy lunch!
"Beluga" 2015 350HD 3.2D, 3.73, EL, HR.