I might differ on this point. "Government" workers aren't usually pushed for productivity. They and their supervisors don't depend on keeping a tractor or truck or backhoe "busy" in order to make a profit and keep their jobs. They usually hire out their major work to private contractors who are working on a margin. Often the city equipment sits idle. When it does go out, it's used by a small crew to do some relatively minor work. Depending on the city, they probably have their own civil-servant garage mechanics maintaining everything.
Next in this hierarchy would be utility companies. On average, they are not as hard on equipment as their contractors would be. On the other hand, they sometimes keep equipment until it's rusted out. Both utility company and city/county/state equipment is usually replaced due to AGE instead of HOURS.
In general, I'd rather have a tractor that's been used to sweep sidewalks or mow right-of-way, etc. by a city crew than the same tractor used hard 8 - 10 hours per day by a contractor trying to make a profit. Look at two backhoes bought at the same time -- One is hauled around on a trailer by the city and used to replace a culvert every now and then. The other is owned by a contractor working for the same city doing sewer work 50 hours per week.
Generally speaking . . .