IIRC, normal double deckers tend to be 4-6MPG, with hybrids getting 8-10MPG.
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Diesel school buses are already the most fuel-efficient in the industry, due to a higher BTU count compared to other fuels, providing better fuel economy and a longer operating range compared to similar-sized gasoline, propane or compressed natural gas (CNG) engines.
Fuel efficiencyFuel efficiencies used in this analysis were as follows: diesel bus: 4.82 miles per diesel gallon; diesel-hybrid bus: 5.84 miles per diesel gallon; natural gas bus: 4.47 miles per diesel gallon equivalent; and battery electric bus: 2.02 kWh per mile, which accounts for a 90 percent charging efficiency.
A typical passenger car carrying one person gets 25 passenger miles per gallon, while a conventional bus at its capacity of 70 (seated and standing) gets 163 passenger miles per gallon. These fuel savings yield commensurate cuts in CO2 emissions.
“A typical passenger car carrying one person gets 25 passenger miles per gallon, while a conventional bus at its capacity of 70 (seated and standing) gets 163 passenger miles per gallon.” So the claim : A full bus (70 people) is 6.5 times more fuel efficient then a car.
Diesel powers over 90% of all school buses thanks to its combination of fuel safety, energy efficiency, reliability, durability, established fueling and maintenance network, range and operational flexibility, secondary markets and low acquisition and operating costs.
A diesel engine requires less fuel to produce the same output as a gas engine. A conventional gas engine operates via a spark ignition system, which burns more fuel than a diesel engine's combustion system. As a result, diesel buses are more fuel-efficient per gallon and burn less fuel while idling.
Since they do not use gasoline or diesel, BEBs do not produce tailpipe pollution. Thus, BEBs offer a better option than other bus technologies for reducing our greenhouse gas emissions, as well as other harmful pollutants in urban areas.