Promising_Confinement -
I also agree with the weight reduction.
I don't know if the aero will have as big a payoff because you are averaging very low speeds. Aero does help you 100% of the time you are moving, but the return-on-investment is much faster with freeway driving.
Do the local elections near you use coroplast in their signage? Coroplast is corrugated plastic, looks just like cardboard, but made with plastic. Lot's of hypermilers snag those for free after elections because the signs need to be taken down anyway.
CarloSW2
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