If a 5000+ pound 488 cu in 2wd V10 with 3.54's can get 15 mpg on the highway, so should the 440.
Overdrive, Diff ratio, Low rolling resistance tires, Air Fuel ratio higher than 14.7, or alternatively custom controlled EGR, can raise the fuel economy of a “Torque Monster” engine choice.
Nearly invisible aerodynamic tweaks underneath the car can help MPG too.
