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As much as the fuel tank is designed to hold. Your larger buses are all diesel or CNG anymore, so you'd be looking at a small- to mid-sized bus if you were running on petrol (some prefer it over diesel, because they don't have to deal with diesel aftertreatment systems with a petrol engine), so we're talking 20 - 100 gallons, dependent on the size of the bus and the configuration.

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9y ago

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