Navalyze · Oil tanker · Ship

EFFIE MAERSK

IMO: 9682978
Type: Oil tanker
Average cargo carried: 95,900 t
Flag (estimated): Denmark
Port of registry: Svendborg
Technical efficiency: EEDI 2.69 g CO₂/t·nm
Former names: BRITISH CENTURY

ISM company (DoC holder) in 2025: SYNERGY DENMARK A/S · part of Synergy Marine

Report year

2018 at a glance

From the 2018 THETIS-MRV report. Carries about 68,403 t of cargo on average.

Fuel kg/nm

156

Oil tanker median 140 kg/nm (+12%)

CO₂ per transport work (cargo)

7.13

g CO₂/t·nm · Oil tanker median 8.86 (−20%)

Average speed

9.8 kn

Oil tanker median 9.8 kn (+0%)

Fuel per day at sea

36.9 t/day

Fuel consumed

3,176 t

CO₂ emitted

9,918 t

Distance sailed

20,337 nm

CO₂ ÷ CO₂ per mile

Time at sea

2,066 h

86 days, 24% 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 147 kg/nm · median 129 (+14%)

76.1Ranks 1,121 of 1,665, lowest first191

Average speedThis ship 11.9 kn · median 10.7 (+11%)

8.0Faster than 85% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 4.82 g CO₂/t·nm · median 7.95 (−39%)

4.51Ranks 223 of 1,665, lowest first27.7

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2018

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 EU37%
Into the EU56%
At berth in the EU7%

Fuel burned laden

–

Not reported

CO₂ at berth

679 t

6.9% 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

EFFIE MAERSK
Oil tanker median

120.0130.0140.0150.0160.0170.0

’182018’202020’212021’222022’232023’252025

Average speed, kn

EFFIE MAERSK
Oil tanker median

9.010.011.012.013.0

’182018’202020’212021’222022’232023’252025

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

EFFIE MAERSK
Oil tanker median

0.05.010.015.020.0

’182018’202020’212021’222022’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2023→2025	+2.6 kn	−8%	+17%	+4,469%	–	2.6 kn faster, fuel per mile down 8%; better than speed alone explains (hull, engine or trade).
2022→2023	−2.7 kn	+17%	−9%	−97%	–	2.7 kn slower, fuel per mile up 17%; worse than speed alone explains (fouling, weather, loading or trade).
2021→2022	−0.5 kn	−4%	−8%	+124%	+19%	0.5 kn slower, fuel per mile down 4%; in line with the speed change.
2020→2021	+1.1 kn	−11%	−2%	+11%	−65%	1.1 kn faster, fuel per mile down 11%; better than speed alone explains (hull, engine or trade).
2018→2020	+1.6 kn	+3%	+19%	−22%	+115%	1.6 kn faster, fuel per mile up 3%; 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	SYNERGY DENMARK A/S	8,544	26,925	58,249	4,909	11.9	147	4.82	61%
2023	not published	204	645	1,275	137	9.3	160	–	–
2022	not published	5,429	16,987	39,582	3,307	12.0	137	6.27	53%
2021	not published	2,520	7,874	17,636	1,411	12.5	143	5.28	–
2020	not published	2,561	8,028	15,890	1,399	11.4	161	15.3	–
2018	not published	3,176	9,918	20,337	2,066	9.8	156	7.13	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	SYNERGY DENMARK A/S	4.82	7.95	−39%	223 of 1,665	ABS	A+C
2023	not published	–	–	–	–	ABS	A
2022	not published	6.27	8.51	−26%	518 of 1,961	ABS	C
2021	not published	5.28	8.86	−40%	277 of 1,789	ABS	C
2020	not published	15.3	9.03	+69%	1,438 of 1,870	ABS	C
2018	not published	7.13	8.86	−20%	607 of 1,779	ABS	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.