To edit parameters for fuel consumption math calculation:

svc=unit/update_fuel_math_params

Parameters:

{
	"itemId":<long>,	/* unit ID */
	"idling":<double>,	/* idling, litres per hour */
	"urban":<double>,	/* urban cycle, litres per 100 km */
	"suburban":<double>,	/* suburban cycle, litres per 100 km */
	"loadCoef":<double>	/* coefficient when moving under load */
}

Return result:

{}	/* OK */