Navalyze · Oil tanker · Ship

MONTESTENA

IMO: 9585883
Type: Oil tanker
Average cargo carried: 65,821 t
Flag (estimated): Portugal
Port of registry: Madeira
Technical efficiency: EEDI 2.86 g CO₂/t·nm

ISM company (DoC holder) in 2025: Ibaizabal Tankers SL

Report year

2019 at a glance

From the 2019 THETIS-MRV report. Carries about 1,572,793 t of cargo on average.

Fuel kg/nm

146

CO₂ per transport work (cargo)

0.29

g CO₂/t·nm

Average speed

10.3 kn

Fuel per day at sea

35.9 t/day

Fuel consumed

9,279 t

CO₂ emitted

28,977 t

Distance sailed

63,531 nm

CO₂ ÷ CO₂ per mile

Time at sea

6,197 h

258 days, 71% 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 150 kg/nm · median 129 (+17%)

76.1Ranks 1,185 of 1,665, lowest first191

Average speedThis ship 11.0 kn · median 10.7 (+3%)

8.0Faster than 58% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 7.19 g CO₂/t·nm · median 7.95 (−10%)

4.51Ranks 689 of 1,665, lowest first27.7

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2019

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 EU46%
Into the EU45%
At berth in the EU10%

Fuel burned laden

4,046 t

44% of all fuel; 56% in ballast or unladen

CO₂ at berth

2,762 t

9.5% 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

MONTESTENA
Oil tanker median

120.0130.0140.0150.0160.0170.0

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

Average speed, kn

MONTESTENA
Oil tanker median

10.010.511.011.512.0

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

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

MONTESTENA
Oil tanker median

6.57.07.58.08.5

’242024’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	−0.8 kn	+3%	−4%	+3%	+9%	0.8 kn slower, fuel per mile up 3%; worse than speed alone explains (fouling, weather, loading or trade).
2023→2024	+1.1 kn	−1%	+8%	+43%	–	1.1 kn faster, fuel per mile flat; better than speed alone explains (hull, engine or trade).
2022→2023	−0.5 kn	−3%	−7%	−39%	–	0.5 kn slower, fuel per mile down 3%; worse than speed alone explains (fouling, weather, loading or trade).
2021→2022	+0.3 kn	−7%	−4%	+13%	–	Same speed, fuel per mile down 7%; better than speed alone explains (hull, engine or trade).
2020→2021	+0.0 kn	+8%	+8%	−12%	–	Same speed, fuel per mile up 8%; worse than speed alone explains (fouling, weather, loading or trade).
2019→2020	+0.6 kn	+4%	+10%	+17%	–	0.6 kn faster, fuel per mile up 4%; better than speed alone explains (hull, engine or trade).
2018→2019	+0.2 kn	−2%	−1%	−19%	–	Same speed, fuel per mile flat; 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	Ibaizabal Tankers SL	9,999	31,498	66,557	6,050	11.0	150	7.19	–
2024	Ibaizabal Tankers SL	9,434	29,746	64,387	5,471	11.8	147	6.62	–
2023	not published	6,660	21,021	44,905	4,188	10.7	148	0.45	53%
2022	not published	11,168	35,256	73,318	6,520	11.2	152	0.26	48%
2021	not published	10,582	33,413	64,787	5,928	10.9	163	0.32	48%
2020	not published	11,218	35,406	74,042	6,803	10.9	152	0.31	48%
2019	not published	9,279	28,977	63,531	6,197	10.3	146	0.29	44%
2018	not published	11,590	36,148	78,057	7,709	10.1	149	0.26	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	Ibaizabal Tankers SL	7.19	7.95	−10%	689 of 1,665	Lloyd's Register	A
2024	Ibaizabal Tankers SL	6.62	8.06	−18%	588 of 1,787	Lloyd's Register	A
2023	not published	–	–	–	–	Lloyd's Register	A
2022	not published	–	–	–	–	Lloyd's Register	A
2021	not published	–	–	–	–	Lloyd's Register	A
2020	not published	–	–	–	–	Lloyd's Register	A
2019	not published	–	–	–	–	Lloyd's Register	–
2018	not published	–	–	–	–	Lloyd's Register	–

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.