Navalyze · Oil tanker · Ship

ROSE I

IMO: 9376945
Type: Oil tanker
Average cargo carried: 18,692 t
Port of registry: Monrovia
Technical efficiency: EEXI 5.68 g CO₂/t·nm
Former names: STAR I

ISM company (DoC holder) in 2025: FRONTIER SHIPOWNERS CO S.A

Report year

2025 at a glance

From the 2025 THETIS-MRV report. Carries about 18,692 t of cargo on average.

Fuel per mile

87.2 kg/nm

Oil tanker median 128.5 kg/nm (−32%)

CO₂ per transport work (cargo)

14.96

g CO₂/t·nm · Oil tanker median 7.95 (+88%)

Average speed

11.3 kn

Oil tanker median 10.7 kn (+6%)

Fuel per day at sea

23.6 t/day

Fuel consumed

322 t

CO₂ emitted

1,033 t

1,049 t CO₂eq incl. CH₄ and N₂O

Distance sailed

3,695 nm

CO₂ ÷ CO₂ per mile

Time at sea

328 h

14 days, 4% 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 87.2 kg/nm · median 128.5 (−32%)

76.1Ranks 281 of 1,665, lowest first190.8

Average speedThis ship 11.3 kn · median 10.7 (+6%)

8.0Faster than 68% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 14.96 g CO₂/t·nm · median 7.95 (+88%)

4.51Ranks 1,299 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 ports4%
From the EU44%
Into the EU43%
At berth in the EU9%

56% of this ship's CO₂ falls under the EU ETS (581 t).

Fuel burned laden

–

Not reported

CO₂ at berth

8.5%

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

ROSE I
Oil tanker median

80.0100.0120.0140.0

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

Average speed, kn

ROSE I
Oil tanker median

8.09.010.011.012.013.0

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

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

ROSE I
Oil tanker median

5.010.015.020.0

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

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2023→2025	−1.3 kn	+6%	−6%	−59%	−4%	1.3 kn slower, fuel per mile up 6%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+4.0 kn	−22%	+14%	−54%	−18%	4.0 kn faster, fuel per mile down 22%; better than speed alone explains (hull, engine or trade).
2021→2022	−0.1 kn	−5%	−6%	−11%	+13%	Same speed, fuel per mile down 5%; in line with the speed change.
2020→2021	−2.9 kn	+13%	−15%	−44%	+21%	2.9 kn slower, fuel per mile up 13%; worse than speed alone explains (fouling, weather, loading or trade).
2019→2020	−0.4 kn	+10%	+6%	−27%	−18%	0.4 kn slower, fuel per mile up 10%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	+1.1 kn	−3%	+7%	+52%	+5%	1.1 kn faster, fuel per mile down 3%; better than speed alone explains (hull, engine 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
2025part-year	FRONTIER SHIPOWNERS CO S.A	0	0	–	0	–	–	–	–
2025	Sera Shipping Co	322	1,033	3,695	328	11.3	87.2	14.96	–
2023	not published	737	2,340	8,946	709	12.6	82.4	15.55	–
2022	not published	2,038	6,447	19,288	2,236	8.6	105.7	19.07	–
2021	not published	2,410	7,621	21,681	2,492	8.7	111.2	16.83	–
2020	not published	3,779	11,924	38,465	3,313	11.6	98.2	13.88	–
2019	not published	4,688	14,652	52,414	4,354	12.0	89.4	16.91	–
2018	not published	3,178	9,936	34,595	3,164	10.9	91.9	16.09	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025part-year	FRONTIER SHIPOWNERS CO S.A	–	–	–	–	EMICERT	A
2025	Sera Shipping Co	14.96	7.95	+88%	1,299 of 1,665	Bureau Veritas	A
2023	not published	15.55	8.44	+84%	1,438 of 1,797	EMICERT	A
2022	not published	19.07	8.51	+124%	1,675 of 1,961	EMICERT	A
2021	not published	16.83	8.86	+90%	1,444 of 1,789	EMICERT	A
2020	not published	13.88	9.03	+54%	1,358 of 1,870	EMICERT	A
2019	not published	16.91	8.83	+92%	1,560 of 1,919	DNV	B
2018	not published	16.09	8.86	+82%	1,434 of 1,779	DNV	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.