[BCM43]

Aaron Gordon at Vice gives some explanations - most important cost-related bit seems to be they weight upfront cost a lot more than amortized cost, and non-electric does better on that front.

https://www.vice.com/en/article/3an4k8/dont-expect-the-usps-...

[a9h74j]

Weight-per-wheel also figures into wear inflicted on local roads.

[blaser-waffle]

Everyone hates OpEx, even Feddy'Gov.