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Let me explain real world experience to you. It's called 20+ years driving, fixing, maintaining and making money with vehicles that most people just use to go back and forth to work. I have owned or driven every type of roadgoing vehicle for commercial use that you can think of, and have clocked more miles in that time than most people would do in a lifetime. Whether gas or diesel, been there, done that. But I never lost my curiosity, which makes me want to learn more about why vehicles are not operating to their maximum mpg, because for me, it's my livelihood as well as my hobby.
Having said that, given the variables that you are working with and the fact that you drive a big, heavy, high powered, high drag vehicle with high frictional losses in the driveline and high road friction because of the tires, along with a propensity for high speed, you are not going to win an mpg contest. The laws of physics and thermodynamics are working against you, and unless you have figured out a way to take a 28 percent efficient gas motor to well past 50 percent your gains will be incremental at best and nonexistent at worst with the stock set up you have. No amount of overdrive is going to change that and that was the point.
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