My suggestion was streamlining the three wheeler, though. The initial RR loss would probably be insignificant until the extra weight of the chassis was shed, but as the project were to progress, it would take a better chunk of the RR away as well. IF you've got less weight on a tire, it's bound to have lower frictional loss.
On a Metro, I don't think the wheel and associated parts even weigh 80 lbs, honestly. I could be wrong, though.
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