Navalyze · Oil tanker · Ship

VS LEIA

IMO: 9303730
Type: Oil tanker
Average cargo carried: 21,820 t
Flag (estimated): Isle of Man
Port of registry: Douglas
Technical efficiency: EEXI 5.64 g CO₂/t·nm

ISM company (DoC holder) in 2025: VALLOEBY LEIA LIMITED · part of Valloeby

Report year

2023 at a glance

From the 2023 THETIS-MRV report. Carries about 15,946 t of cargo on average.

Fuel kg/nm

107

Oil tanker median 129 kg/nm (−17%)

CO₂ per transport work (cargo)

21.2

g CO₂/t·nm · Oil tanker median 8.44 (+151%)

Average speed

11.0 kn

Oil tanker median 11.0 kn (+0%)

Fuel per day at sea

28.2 t/day

Fuel consumed

4,058 t

CO₂ emitted

12,770 t

Distance sailed

37,811 nm

CO₂ ÷ CO₂ per mile

Time at sea

3,448 h

144 days, 39% of the year

Within the oil tanker fleet, 2025

Set against all 1,665 oil tanker ships with a full-year 2025 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 kg/nmThis ship 94.0 kg/nm · median 129 (−27%)

76.1Ranks 366 of 1,665, lowest first191

Average speedThis ship 10.0 kn · median 10.7 (−7%)

8.0Faster than 29% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 13.6 g CO₂/t·nm · median 7.95 (+71%)

4.51Ranks 1,252 of 1,665, lowest first27.7

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 ports53%
From the EU8%
Into the EU12%
At berth in the EU27%

Fuel burned laden

–

Not reported

CO₂ at berth

3,509 t

27.5% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

–

CO₂eq on top of CO₂ alone, from CH₄ and N₂O

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 kg/nm

VS LEIA
Oil tanker median

80.0100.0120.0140.0

’182018’192019’202020’212021’222022’232023’242024’252025

Average speed, kn

VS LEIA
Oil tanker median

7.08.09.010.011.0

’182018’192019’202020’212021’222022’232023’242024’252025

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

VS LEIA
Oil tanker median

5.010.015.020.025.0

’182018’192019’202020’212021’222022’232023’242024’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	+1.6 kn	−6%	+12%	+35%	−38%	1.6 kn faster, fuel per mile down 6%; better than speed alone explains (hull, engine or trade).
2023→2024	−2.6 kn	−7%	−29%	−17%	+4%	2.6 kn slower, fuel per mile down 7%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+1.0 kn	+19%	+31%	+97%	+24%	1.0 kn faster, fuel per mile up 19%; in line with the speed change.
2021→2022	−0.8 kn	−7%	−14%	−27%	−16%	0.8 kn slower, fuel per mile down 7%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	−0.1 kn	+10%	+9%	−19%	+8%	Same speed, fuel per mile up 10%; worse than speed alone explains (fouling, weather, loading or trade).
2019→2020	+2.3 kn	−18%	+5%	−6%	+13%	2.3 kn faster, fuel per mile down 18%; better than speed alone explains (hull, engine or trade).
2018→2019	+1.4 kn	+7%	+27%	−19%	−9%	1.4 kn faster, fuel per mile up 7%; better than speed alone explains (hull, engine or trade).

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	Hours at seah	Average speedknots at sea	Fuel kg/nmthis ship	CO₂ per transport work (cargo)g/t·nm, this ship	Laden fuel
2025	VALLOEBY LEIA LIMITED	3,983	12,583	42,372	4,252	10.0	94.0	13.6	–
2024	VALLOEBY LEIA LIMITED	3,143	9,855	31,338	3,749	8.4	100	22.0	–
2023	not published	4,058	12,770	37,811	3,448	11.0	107	21.2	–
2022	not published	1,729	5,415	19,185	1,923	10.0	90.1	17.1	–
2021	not published	2,563	8,098	26,437	2,447	10.8	96.9	20.3	–
2020	not published	2,887	9,100	32,670	3,004	10.9	88.4	18.9	–
2019	not published	3,737	11,731	34,861	4,074	8.6	107	16.7	–
2018	not published	4,338	13,727	43,156	6,028	7.2	101	18.3	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	VALLOEBY LEIA LIMITED	13.6	7.95	+71%	1,252 of 1,665	DNV	B
2024	VALLOEBY LEIA LIMITED	22.0	8.06	+173%	1,556 of 1,787	DNV	B
2023	not published	21.2	8.44	+151%	1,560 of 1,797	Lloyd's Register	B
2022	not published	17.1	8.51	+101%	1,616 of 1,961	Lloyd's Register	B
2021	not published	20.3	8.86	+129%	1,530 of 1,789	Lloyd's Register	B
2020	not published	18.9	9.03	+109%	1,556 of 1,870	Lloyd's Register	B
2019	not published	16.7	8.83	+89%	1,552 of 1,919	Lloyd's Register	B
2018	not published	18.3	8.86	+106%	1,496 of 1,779	Lloyd's Register	B

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.