Retrofit is one thing, I'm talking purpose-built. Retrofit means you have the expense of the original drive train, the cost of removing it, the cost of the replacement drive train, and the cost of installing it.
Now I'm curious what the daily average number of miles driven is on a school bus, the fuel consumption, and the annual maintenance breakdown.
My WAG is that even at a $100k premium, amortizing the cost over time would make it the cheaper option.
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