A thermal choke, includes (1) a body, comprising a heat conductive material, (2) an electric heater, on or in the body, (3) a temperature sensor, on or in the body, and (4) a fin, in a channel surrounded by the body. The thermal choke is configured to fit between a throttle assembly and a cylinder of a spark ignition engine.

An apparatus and process for cooling a pressurized gas for feeding to one or more vehicle fuel tanks for fueling a vehicle can be configured so that a pressurized gas (e.g. hydrogen or natural gas) for fueling one or more vehicles can be cooled prior to dispensing via a heat transfer fluid that cools the pressurized gas and transfers the heat of the pressurized gas toward fluid of a heat sink source. The transfer of the heat to the heat sink source fluid can occur via a refrigerant in some embodiments.

A gaseous fuel supply system for a clean combustion engine of a vehicle having a vehicle cooling system. The supply system comprises: a gaseous fuel tank storing pressurized gaseous fuel; at least a first supply line arranged to supply pressurized gaseous fuel from the gaseous fuel tank to the clean combustion engine; at least a first heat exchanging component arranged in the first supply line. The first heat exchanging component is arranged to transfer heat between a cooling fluid of the vehicle cooling system and the pressurized gaseous fuel in the first supply line.

An apparatus and process for cooling a pressurized gas for feeding to one or more vehicle fuel tanks for fueling a vehicle can be configured so that a pressurized gas (e.g. hydrogen or natural gas) for fueling one or more vehicles can be cooled prior to dispensing via a heat transfer fluid that cools the pressurized gas and transfers the heat of the pressurized gas toward fluid of a heat sink source. The transfer of the heat to the heat sink source fluid can occur via a refrigerant in some embodiments.