Mine is 07 and got only 5900 mile
I bought it on 08, it was sitting on the lot for a year so it had 0 km on it, paid 21 g and the dude at ford couple months ago said trade in value is 14 g
General rule is buying a car is not a good investment, specially American compared to Japanese but i dont care because at the end of the night when i put my head on my pillow, i'll smile that i have a beauty sitting in my garage + i am planning to keep her for a long time

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07 Mustang Pony pkg 4.0L V6
Appearance: Roush hood scoop, rocker panel, custom GT500 chin spoiler, side louvers, racing stripes, shifter bezel, door sill plates, Sequential tail lights
Performance: C&L intake, Bama/Tillman 91 Race tune, SCT X3, Mac dual exhaust kit, OEM Ford 3.73 gears/T-lock on 7.5'