What engine is in most school buses?

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.



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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.

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On the outside, school buses haven't changed much in almost 100 years, and there's a reason for that. A 1939 conference determined the yellow color, black text, and boxy shape that have come to symbolize the iconic childhood transport.

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Over the long haul, newer diesel engines will last 15-20 years in a fleet, while a gasoline engine may need to be replaced once or even twice during the life of a school bus. “All of these are important for fleet managers to stop and consider when choosing a new school bus,” says Hedgecock.

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Period. Why? Diesel is the most fuel-efficient engine type on the market. Diesel outperforms other fuels in operating range.

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My rule of thumb when I was shopping for a bus was a well maintained gas bus with under 100,000 miles or a well maintained diesel bus with under 200,000. In theory, a well maintained diesel engine can practically run forever. I drive city buses. They often have multiple million miles before they retire them.

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The United States. In general, most American transit systems expect their buses to have a useful life of 12 years and 250,000 miles. This time frame is due to the fact that, after their buses have been around for 12 years, they are eligible to receive replacement bus funding from the federal government.

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  • Diesel is the most fuel-efficient engine type on the market.
  • Diesel offers up to 50% better fuel economy compared to other similar-size gasoline, propane or compressed natural gas engines.**
  • Diesel outperforms other fuels in operating range.
  • Diesel buses have better resale value.
  • Diesel buses are less expensive to buy.


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The average 40foot bus is a 9L engine with 280hp. That same engine in a truck would be rated 325-400hp.

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Reading Buses' Bus Hound was recorded doing a lap speed of 76.785mph (123.57km/h) at Bedford's Millbrook Proving Ground. It runs on biomethane compressed natural gas and is painted black and white like a Friesian cow. It normally carries passengers around Reading. The UK Timing Association confirmed the new record.

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It's about 230 miles long. It takes 7 hours and 50 minutes. It's Scottish Citylink's route 915 (or 916) from Glasgow's Buchanan Bus Station all the way to Uig Pier on the Isle of Skye via Fort William and Kyle of Lochalsh.

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Diesel. Among other types of fuel transport vehicles use, diesel fuel is a popular choice for those working with larger-capacity vehicles such as buses, vans, trucks, and boats.

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