430 horsepower either way, and $8,631 between them. One runs on liquefied natural gas, one on diesel, and the choice between them is not really about the trucks. It is about three questions you can answer before you spend anything: what does fuel cost where you operate, can you actually refill, and what does your registration authority demand.

Get those three wrong and the most expensive truck in the comparison is not the LNG one — it is whichever one cannot work.

What you are comparing

The two machines are closer than the price gap suggests, and further apart than the horsepower figure suggests. Both are 6×4 tractors rated at 25 tonnes total mass with a 430 hp engine. From there they diverge sharply.

The gas truck has more torque, and that matters more than horsepower

Read the torque rows carefully. The LNG engine makes 2,200 Nm against the diesel's 2,000 Nm, and it holds that peak across a band from 1,100 to 1,300 rpm rather than at a single speed. In practice that means the GTL LNG pulls away from a standstill or a low-speed climb with a little more authority, which is exactly what you want when the trailer is heavy and the road is not flat.

The trade is in the axle ratio. The LNG truck runs 3.7 against the diesel's 3.083, which is why its top speed is listed at 89 km/h while the EST diesel is quoted at 110 km/h fully loaded. If your revenue is earned per kilometre on open highway, that gap is real money. If it is earned per tonne on secondary roads, it is noise.

"The gas engine is stronger at the bottom of the rev range and slower at the top. Which one you want depends entirely on what your route looks like."

The compliance question is not the obvious way round

Most buyers assume the diesel is the safe choice on registration and the gas truck is the risky one. These two sheets invert that. The LNG tractor declares China VI. The diesel declares China III.

That single line may decide the purchase before any other consideration enters. If you plan to operate in a city or corridor that restricts by emission standard, or if you expect your market to tighten rules during the ownership period, the China VI rating on the GTL LNG is worth more than the $8,631 you save by buying down to the diesel. Resale value follows the same logic: the truck that can still be registered in five years is the one worth owning in five years.

Conversely, if you operate in a market that asks no emission question at the border, you may be paying for certification you will never use. Confirm your registration requirement with the sales team before ordering either configuration.

"Check the emission line against your own registration rules first. Everything else in this comparison is negotiable; that one is not."

Refuelling: the hard constraint nobody prices

This is where LNG purchases succeed or fail, and it is worth being blunt about it. The GTL carries between 995 and 1,000 litres of LNG. That is a large reserve, and it buys you a long range — but only if there is a station at the other end.

Before you sign anything, map three things: every LNG station on your regular routes, the operating hours of each, and whether any of them are outside your drivers' legal driving window. A route that requires a detour or an overnight wait to refuel has silently cost you the entire fuel saving, plus the trip you could not run.

If your operation is hub-and-spoke from a fixed depot with its own filling point, the calculation looks very different and often excellent. If you run irregular long-haul into unfamiliar territory, carry that risk honestly.

Gearboxes and what they cost you

The diesel EST runs a ZF 12TX2420TD in an aluminium case with automatic operation. The LNG GTL runs a Fast 12JSDX240TA manual. Note that this is one area where the cheaper truck is better equipped: an automated gearbox reduces driver fatigue and, in a mixed-skill driver pool, produces more consistent fuel consumption than a manual.

The counter-argument is maintenance geography. A Fast manual gearbox is a simpler object to rebuild in a general workshop than a ZF automated unit, and for operators far from dealer support that counts for a great deal. Decide which risk you prefer — a gearbox you cannot easily fix, or a gearbox your drivers work harder.

Dimension check: the LNG truck is longer

Wheelbase matters if you run tight yards or weigh bridges with fixed geometry. The LNG GTL sits on 3,825 + 1,350 mm, some 525 mm longer between the axles than the diesel EST's 3,300 + 1,350 mm. Kerb weight is also higher at up to 9.4 tonnes against 8,944 kg, which is the cost of carrying the cylinders. Where axle limits are enforced, that difference is subtracted from your payload.

So which one should you buy?

Buy the LNG tractor if you have reliable access to LNG on your regular routes; if your market already restricts by emission standard or you expect it to; if your work involves heavy breakaway loads where the extra 200 Nm earns money; or if you carry dangerous goods, for which this configuration is purpose-built.

Buy the diesel EST if you run long open-highway kilometres where the 3.083 ratio and 110 km/h cruising speed pay; if refuelling infrastructure for gas is uncertain anywhere you operate; if you want the automated gearbox; or if your registration market accepts China III and you would rather keep $8,631 in working capital.

Talk to us before either if you serve an emissions-restricted region, because the two trucks sit either side of a regulatory line that no amount of driving skill will move.