older truck vs newer truck

[Sledge]

Not trying to pile on here, but just sticking to numbers...
...but just with my own 110,000 miles per year...
...a @m*m^2 engine, in a Aero truck, driving +/-60MPH keeping the boost below 20 PSI should average about 9.5 MPG...
...a rebuilt "legacy" engine, in a classic long nose driving at 70 MPH with boosts at max on pulls and accelerations, with a high horsepower engine should average about 5.5 MPG.
at $2.67978 average price of Diesel Fuel that a loss of $22,566, and that's just fuel.
Sounds extreme, but I don't think it really is in a 65,000 GVW average operation going from Michigan to Kentucky on the I-75.