Navalyze · Oil tanker · Ship

WONDER SIRIUS

IMO: 9285847
Type: Oil tanker
Average cargo carried: 19,904 t
Port of registry: Majuro
Technical efficiency: EIV 3.67 g CO₂/t·nm
Former names: TOFTEVIKEN, DUBAI HOPE

ISM company (DoC holder) in 2024: CASTOR SHIPS S.A.

Report year

2023 at a glance

From the 2023 THETIS-MRV report. Carries about 19,904 t of cargo on average.

Fuel per mile

363.2 kg/nm

Oil tanker median 129.1 kg/nm (+181%)

CO₂ per transport work (cargo)

57.16

g CO₂/t·nm · Oil tanker median 8.44 (+577%)

Average speed

4.4 kn

Oil tanker median 11.0 kn (−60%)

Fuel per day at sea

38.0 t/day

Fuel consumed

664 t

CO₂ emitted

2,080 t

Distance sailed

1,828 nm

CO₂ ÷ CO₂ per mile

Time at sea

420 h

18 days, 5% of the year

Within the oil tanker fleet, 2023

Set against all 1,797 oil tanker ships with a full-year 2023 report. Bigger ships burn more per mile but less per tonne of cargo, so read fuel per mile with the ship's size in mind.

Fuel per mileThis ship 363.2 kg/nm · median 129.1 (+181%)

80.4Ranks 1,793 of 1,797, lowest first192.7

Average speedThis ship 4.4 kn · median 11.0 (−60%)

8.1Faster than 1% of oil tanker ships12.4

CO₂ per transport work (cargo)This ship 57.16 g CO₂/t·nm · median 8.44 (+577%)

4.78Ranks 1,757 of 1,797, lowest first25.50

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2023

THETIS splits each ship's CO₂ by voyage type. The split sets how much falls under the EU ETS: all of it within the EU and at berth, half of it on voyages into or out of the EU.

Between EU ports0%
From the EU78%
Into the EU9%
At berth in the EU13%

Fuel burned laden

91% in ballast or unladen

CO₂ at berth

13.4%

Alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil

CO₂eq ÷ CO₂

–

Uplift from CH₄ and N₂O, counted in full from 2026

Over the years

Full-year reports only. The Oil tanker median is the middle ship of all oil tanker ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel per mile, kg/nm

WONDER SIRIUS
Oil tanker median

100.0200.0300.0400.0

’182018’192019’202020’212021’222022’232023

Average speed, kn

WONDER SIRIUS
Oil tanker median

4.06.08.010.012.0

’182018’192019’202020’212021’222022’232023

CO₂ per transport work (cargo), g CO₂/t·nm

WONDER SIRIUS
Oil tanker median

0.020.040.060.0

’182018’192019’202020’212021’222022’232023

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2022→2023	−5.0 kn	+173%	+26%	−94%	+706%	5.0 kn slower, fuel per mile up 173%; worse than speed alone explains (fouling, weather, loading or trade).
2021→2022	−0.5 kn	−34%	−37%	+63%	−32%	0.5 kn slower, fuel per mile down 34%; better than speed alone explains (hull, engine or trade).
2020→2021	+3.6 kn	+17%	+85%	−26%	−26%	3.6 kn faster, fuel per mile up 17%; better than speed alone explains (hull, engine or trade).
2019→2020	−1.9 kn	−3%	−26%	−47%	+45%	1.9 kn slower, fuel per mile down 3%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−1.9 kn	+4%	−16%	+661%	+20%	1.9 kn slower, fuel per mile up 4%; worse than speed alone explains (fouling, weather, loading or trade).

Part-year reports are left out of these comparisons. Fuel per mile rises roughly with the square of speed for a given ship, so a change in speed explains much of a change in fuel per mile.

Every reporting year

One row per THETIS-MRV report. A ship that changed operator during a year has a part-year report for each.

Operation

Year	ISM company	Fuel t	CO₂ t	Distance nm	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2024part-year	CASTOR SHIPS S.A.	571	1,787	3,640	450	8.1	156.7	14.88	–
2023	not published	664	2,080	1,828	420	4.4	363.2	57.16	9%
2022	not published	4,005	12,532	30,087	3,193	9.4	133.1	7.09	–
2021	not published	3,714	11,682	18,473	1,872	9.9	201.1	10.48	–
2020	not published	4,276	13,674	24,952	3,989	6.3	171.4	14.17	–
2019	not published	8,271	26,059	46,725	5,714	8.2	177.0	9.79	–
2018	not published	1,048	3,288	6,140	608	10.1	170.7	8.13	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2024part-year	CASTOR SHIPS S.A.	–	–	–	–	Lloyd's Register	A
2023	not published	57.16	8.44	+577%	1,757 of 1,797	Lloyd's Register	A
2022	not published	7.09	8.51	−17%	696 of 1,961	Verifavia	A
2021	not published	10.48	8.86	+18%	1,102 of 1,789	Verifavia	A
2020	not published	14.17	9.03	+57%	1,373 of 1,870	Verifavia	A
2019	not published	9.79	8.83	+11%	1,111 of 1,919	Verifavia	A
2018	not published	8.13	8.86	−8%	781 of 1,779	Verifavia	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Oil tanker ships are benchmarked on CO₂ per transport work (cargo) (TW), in g CO₂/t·nm. CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's oil tanker ships. Methods: A delivery notes, B tank monitoring, C flow meters, D direct measurement. FuelEU GHG intensity is not shown: it needs fuel types, which the public file does not carry. Operators are named only from 2024, the first year the public files carry them; earlier years belong to the ship, not to any company.