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i don't have time to give you a full answer but you aren't considering your vehicle weight as far as i can see which will add some draw added horse power.
Friction Drag = Cf x cos theta x weight of vehicle
where Cf is the friction coefficent of your tires, i would use somewhere around 0.012 if you don't have the exact number. theta is the angle away from horizontal, so 0 for level ground.
also, be VERY careful with your units. I taught a Mechanical engineering lab where we calculated drag for vehicles and many students messed up the units. i am not sure where the 1.2 comes into your equation.
hope that helps
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