On a flat road I'd guess you'd top out as stated in a few posts around 130-140. Now going downhill on the other hand haha...well lets just say I threw the car in neutral coming back from the Grand Canyon and was going 105...so that's on no cylinders haha. God only knows how fast otherwise...I got to say my mpg was a good 35-40 for that trip lmao. But do as I say not as I do when i say...kids don't try this at home! 
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2007 SS Mustang V6 Premium
Gray Leather Interior, Manual, V6 PP, Interior Upgrade Package, 35/20 Tint, 14inch Shorty Antenna, Silver 17" Bullitts, GT Spoiler, GT M/T Muffler, CF dash, SR Window Louvers, Roush Retro Knob, Magnetic Blackout Panel, Bullitt Style Fuel Door, Shaker 500, And Some Sweet Mustang Floor Mats! Also had a Carbon Creations OEM CF Hood with Roush Louvers but they went up in flames along with my house on Nov. 4th 2008 
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