Don't be fooled, paying less won't help much since the cost of a bus is a small part of the costs of running a bus route. about half your costs are the bus driver. The most expensive bus is still only 1/3rd of your hourly cost of running the bus. If a more expensive bus is more reliable that could more than make up for a more expensive bus (I don't have any numbers to do math on though).
Half the costs of running a bus route are the driver's labor. The other half needs to pay for maintenance, the cost of the bus, and all the other overhead.
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