How many miles can a bus engine last?

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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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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This timeframe matches a diesel school bus, which has an average lifespan of 12 – 15 years as well.

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If a school bus had an 80-gallon tank and operated with a fuel economy of about 6 miles per gallon, it could travel about 480 miles. According to the U.S. Department of Energy, the average school bus travels 12,000 miles per year 4.

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How Much MPG Does a School Bus Get? Admittedly, the average school bus's fuel economy is what you'd expect of a bus—not great. According to the Alternative Fuels Data Center, school buses get an average fuel economy of just 6.02 miles per gallon (MPG).

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Maximum passenger capacity is 147 – 177, engine power - 185 – 260 kW, fuel tank volume -200 – 400 liters.

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The two technologies are similar, but differences in design mean that diesel engines are built tougher and last longer. This is true for all types of passenger cars, trucks, commercial vehicles and other diesel-powered equipment. Like all engines, diesels only last a long time if they're looked after properly.

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Propulsion. The most common power source since the 1920s has been the diesel engine. Early buses, known as trolleybuses, were powered by electricity supplied from overhead lines.

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