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| quote: | Originally posted by MrJiveBoJingles
That is what I thought, but apparently aerodynamics and weight have something to do with it as well. I am not sure which factor has a larger influence, engine size or the "bulkiness" of the vehicle. |
that site at howstuffworks doesnt say that larger engines are LESS fuel efficient at higher speeds or anything of that sort. its just saying that the power required to change go from one speed to another and the associated usage with changing speed. a tightly wound engine (a honda b series like the integra motors) will turn over MANY more times than my 2.5l subaru motor will. why? because the honda motor is made for HIGH rpms. this uses more gas and therefore lowers fuel economy. this is why a v8 actually gets BETTER mileage at 85mph than a 4cyl will. just think about it in terms of a runner. a short runner taking long strides will work harder to be as fast as a tall runner taking average strides. 
and yes aerodynamics, weight, tires, body shape, underbody aero coverings and drag coefficient all have a factor in this equation.
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