I'm averaging about 14 with my 800hp 5.4L.
Isn't the whole point to driving a V6, getting good mileage? I'd drive it off a cliff if I got that kind of mileage out of a V6 Mustang. Even my AWD V6 Escape averages 18. Is someone stealing your gas at night? Fuel leak? A few dead bodies in the trunk? Parachute? Do you drive around in 1st gear only?
2008 - 4.0 - V6 - 3492LBs with me as driver + 8 Gallons of fuel (Heavy Frigin Boat)
4.10 rear gear ratio – 0.8 Fifth gear ratio - T5 trans
P265-40-18 Tire
All MPG with 91 Octane Kalifornia Shell Gas
Open Highway / Feeway limited traftic at 3000 to 3500 RPM continuously
20 to 22 MPG
City driving very heavy foot = 14 to 17 MPG
Racing and or Track days depending upon track = 7 to 9 MPG