We know that a heavier weight vehicle doesn't suffer reduced fe all that much on the highway, but it does hurt in the stop-n-go, and it makes the go slower. The little diesel is pretty slow in the go dept. already so I'd be after adding lightness. If I found that, say, a more forward Cg is desired I'd look at relocating already heavier stuff like the fuel tank or battery instead of making something heavier than need be.
I forgot what Allert figures his bike's Cd is? Pretty much copy that, and pretty much get that Cd.
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