With respect I ask you to look further into the costs of operating both fueled buses. Fueling alone is the only cost. Oil changes, etc. come into the mix as well.
Did you ever see the oil drained from a diesel engine with 3,000 miles on it, and oil from an LPG engine with the same mileage on it? The oil from the LPG engine will look like new while the oil from the diesel will look more like it has 100,000 miles on it.
You must also consider proposed EPA emission standards for diesel particulates and what changes might be needed to the buses and at what cost of those proposals.
Tune up of LPG vs. diesel, diesel probably wins out on that one. Overall longevity of the engines? Both should have long life.
If I were on a school board I'd sure have to study the diesel vs. propane cost per mileage issue before I could make a decision, but there is certainly more involved than just BTUs per gallon.
As to voter fraud, have you contacted state officials about it?
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