Gas machines dominate the 1-ton class and diesel takes over from about 1.5 tons up. That is not an accident — the engines suit different duty cycles, and buying against the grain usually costs you.
Here is what each actually means day to day, in fuel, service, noise, and what the machine is worth in five years.
Under about 300 hours a year, buy gas — it is cheaper to own and easier to live with. Over that, or if you run breakers and trench all day, buy diesel and take the better torque, efficiency and resale.
For a homeowner, a small farm, or a landscaper running a machine a few hours a week, a gas engine is the cheaper and simpler choice. You service it like a mower, it starts in the cold without ceremony, and the neighbors complain less.
It also keeps the whole package light enough for a half-ton truck and a single-axle trailer.
Diesel earns its premium in sustained load. Hours of trenching, breaker work, or grading is exactly where gas engines lose torque and burn fuel to keep up.
Commercial buyers also care about resale, and the used market pays for diesel. If the machine is a business asset you intend to sell, that is real money.
At low hours, gas usually wins outright: cheaper to buy, cheaper to service, and the fuel difference never accumulates. Past roughly 300–400 hours a year, diesel's efficiency and durability start closing the gap, and past that it pulls ahead.
Yes, in the 1-ton class and for part-time use. They are cheaper, quieter, simpler to service and start easily in the cold. They are not the right choice for all-day production digging.
Under heavy, sustained load, generally yes — that is what the engines are built for. At light hobby hours the difference rarely shows before the rest of the machine ages.