Looks like fuel costs are really low, but maintenance and replacement component cost might be pretty significant: https://www.sciencedirect.com/science/article/

Looks like fuel costs are really low, but maintenance and replacement component cost might be pretty significant: https://www.sciencedirect.com/science/article/pii/S0360544218305395#sec5 https://www.sciencedirect.com/science/article/pii/S036054421...