the optimal speed for efficiency is determined by many things, i seriously doubt it'* 4550 because not only does gearing and the engine play a part, but so does aerodynamics. say your going 1 MPH, your engine isn't using much fuel to go that fast (actually it'* probably idling), now you got 2 MPH using just about the same amount of fuel. while your using about the same amount of gas your going twice as fast and have just about doubled your efficiency (but it'* still shitty at that speed). now, say your going 70 and using X amount of fuel, and as before you go to double your speed to 140. you are using a heck of a lot more fuel at 140 than you are at 70. and this is were aerodynamics becomes a factor. the better the aerodynamics of the car the faster it'* optimal speed for efficiency. does that make sense or did you loose me when i said optimal the first time?
