Navalyze · Oil tanker · Ship

BLUE SKY

IMO: 9413016
Type: Oil tanker
Average cargo carried: 53,281 t
Port of registry: Monrovia
Technical efficiency: EEXI 3.45 g CO₂/t·nm

ISM company (DoC holder) in 2025: Estoril Navigation Ltd

Report year

2025 at a glance

From the 2025 THETIS-MRV report. Carries about 53,281 t of cargo on average.

Fuel per mile

350.2 kg/nm

Oil tanker median 128.5 kg/nm (+173%)

CO₂ per transport work (cargo)

21.07

g CO₂/t·nm · Oil tanker median 7.95 (+165%)

Average speed

7.6 kn

Oil tanker median 10.7 kn (−29%)

Fuel per day at sea

63.8 t/day

Fuel consumed

571 t

CO₂ emitted

1,830 t

1,858 t CO₂eq incl. CH₄ and N₂O

Distance sailed

1,630 nm

CO₂ ÷ CO₂ per mile

Time at sea

215 h

9 days, 2% 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 per mileThis ship 350.2 kg/nm · median 128.5 (+173%)

76.1Ranks 1,658 of 1,665, lowest first190.8

Average speedThis ship 7.6 kn · median 10.7 (−29%)

8.0Faster than 8% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 21.07 g CO₂/t·nm · median 7.95 (+165%)

4.51Ranks 1,417 of 1,665, lowest first27.66

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2025

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 ports8%
From the EU10%
Into the EU53%
At berth in the EU29%

69% of this ship's CO₂ falls under the EU ETS (1,257 t).

Fuel burned laden

61%

39% in ballast or unladen

CO₂ at berth

29.1%

Alongside in EU ports

Methane (CH₄)

0.0 t

Mainly from LNG; small for oil

CO₂eq ÷ CO₂

1.015

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

BLUE SKY
Oil tanker median

100.0200.0300.0400.0

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

Average speed, kn

BLUE SKY
Oil tanker median

6.08.010.012.014.0

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

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

BLUE SKY
Oil tanker median

0.020.040.060.0

’182018’192019’202020’212021’222022’252025

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2023→2025	−4.7 kn	+115%	+33%	−94%	–	4.7 kn slower, fuel per mile up 115%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+4.1 kn	−17%	+25%	+878%	–	4.1 kn faster, fuel per mile down 17%; better than speed alone explains (hull, engine or trade).
2021→2022	−2.8 kn	+15%	−14%	−71%	+41%	2.8 kn slower, fuel per mile up 15%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	+3.6 kn	+44%	+115%	+55%	−80%	3.6 kn faster, fuel per mile up 44%; better than speed alone explains (hull, engine or trade).
2019→2020	+1.1 kn	−32%	−19%	+152%	+279%	1.1 kn faster, fuel per mile down 32%; better than speed alone explains (hull, engine or trade).
2018→2019	−0.1 kn	+5%	+2%	−4%	+5%	Same speed, fuel per mile up 5%; worse than speed alone explains (fouling, weather, loading 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	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2025	Estoril Navigation Ltd	571	1,830	1,630	215	7.6	350.2	21.07	61%
2023	not published	4,233	13,286	25,954	2,113	12.3	163.1	–	54%
2022	not published	520	1,627	2,654	324	8.2	195.9	14.65	42%
2021	not published	1,539	4,868	9,014	821	11.0	170.7	10.36	–
2020	not published	686	2,162	5,803	786	7.4	118.2	52.21	–
2019	not published	398	1,244	2,304	368	6.3	172.6	13.76	–
2018	not published	394	1,230	2,403	374	6.4	163.9	13.12	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	Estoril Navigation Ltd	21.07	7.95	+165%	1,417 of 1,665	ABS	–
2023	not published	–	–	–	–	ABS	–
2022	not published	14.65	8.51	+72%	1,532 of 1,961	ABS	A
2021	not published	10.36	8.86	+17%	1,088 of 1,789	ABS	A
2020	not published	52.21	9.03	+478%	1,821 of 1,870	ABS	A
2019	not published	13.76	8.83	+56%	1,443 of 1,919	ABS	A
2018	not published	13.12	8.86	+48%	1,292 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.