Navalyze · Ro-ro · Ship

LONGSTONE

IMO: 9848479
Type: Ro-ro ship
Average cargo carried: 4,204 t
Flag (estimated): Netherlands
Port of registry: Rotterdam
Technical efficiency: EEXI 11.90 g CO₂/t·nm
Former names: MARIA GRAZIA ONORATO

ISM company (DoC holder) in 2025: P&O Ferries Holdings Ltd

Report year

2020 at a glance

From the 2020 THETIS-MRV report. Carries about 2,362 t of cargo on average.

Fuel kg/nm

155

Ro-ro median 109 kg/nm (+42%)

CO₂ per transport work (cargo)

205

g CO₂/t·nm · Ro-ro median 103 (+99%)

Average speed

15.6 kn

Ro-ro median 14.4 kn (+8%)

Fuel per day at sea

57.9 t/day

Fuel consumed

11,805 t

CO₂ emitted

36,824 t

Distance sailed

76,222 nm

CO₂ ÷ CO₂ per mile

Time at sea

4,892 h

204 days, 56% of the year

Within the ro-ro fleet, 2025

Set against all 235 ro-ro 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 133 kg/nm · median 105 (+27%)

56.6Ranks 185 of 235, lowest first145

Average speedThis ship 15.1 kn · median 14.4 (+5%)

10.9Faster than 60% of ro-ro ships17.0

CO₂ per transport work (cargo)This ship 98.5 g CO₂/t·nm · median 95.2 (+3%)

47.4Ranks 121 of 235, lowest first297

Middle 80% of shipsMiddle 50%Ro-ro medianThis ship

Where the emissions happen, 2020

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 ports95%
From the EU0%
Into the EU0%
At berth in the EU5%

Fuel burned laden

–

Not reported

CO₂ at berth

1,745 t

4.7% 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 Ro-ro median is the middle ship of all ro-ro ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

LONGSTONE
Ro-ro median

100.0120.0140.0160.0

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

Average speed, kn

LONGSTONE
Ro-ro median

14.015.016.017.0

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

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

LONGSTONE
Ro-ro median

50.0100150200250

’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	+0.5 kn	−7%	−4%	+18%	+2%	0.5 kn faster, fuel per mile down 7%; better than speed alone explains (hull, engine or trade).
2023→2024	+0.0 kn	−2%	−2%	−16%	−21%	Same speed, fuel per mile flat.
2022→2023	+0.3 kn	+4%	+6%	+2%	+41%	Same speed, fuel per mile up 4%; in line with the speed change.
2021→2022	−1.2 kn	−12%	−19%	−6%	−26%	1.2 kn slower, fuel per mile down 12%; in line with the speed change.
2020→2021	−0.1 kn	+1%	+1%	−7%	−42%	Same speed, fuel per mile flat.
2019→2020	−1.2 kn	+7%	−0%	+28%	+18%	1.2 kn slower, fuel per mile up 7%; worse than speed alone explains (fouling, weather, loading 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	Hours at seah	Average speedknots at sea	Fuel kg/nmthis ship	CO₂ per transport work (cargo)g/t·nm, this ship	Laden fuel
2025	P&O Ferries Holdings Ltd	8,989	28,064	67,800	4,500	15.1	133	98.5	–
2024part-year	Compagnia Italiana Di Navigazione	5,083	15,864	39,284	2,306	17.0	129	73.7	–
2024part-year	SIEM Ship Management	3,057	9,566	18,055	1,629	11.1	169	201	–
2024	P&O Ferries Holdings Ltd	8,152	25,469	57,339	3,934	14.6	142	96.9	–
2023	not published	9,877	30,841	68,196	4,687	14.6	145	123	–
2022	not published	9,271	28,938	66,692	4,668	14.3	139	87.1	100%
2021	not published	11,097	34,627	70,586	4,546	15.5	157	118	–
2020	not published	11,805	36,824	76,222	4,892	15.6	155	205	–
2019	not published	8,575	26,739	59,501	3,544	16.8	144	173	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Ro-ro median	vs Ro-ro	Rank	Verifier	Methods
2025	P&O Ferries Holdings Ltd	98.5	95.2	+3%	121 of 235	DNV	C
2024part-year	Compagnia Italiana Di Navigazione	–	–	–	–	RINA	A
2024part-year	SIEM Ship Management	–	–	–	–	DNV	C
2024	P&O Ferries Holdings Ltd	96.9	97.5	−1%	109 of 220	DNV	C
2023	not published	123	109	+13%	123 of 221	RINA	A
2022	not published	87.1	90.6	−4%	100 of 223	RINA	A
2021	not published	118	104	+14%	131 of 219	RINA	A
2020	not published	205	103	+99%	184 of 238	RINA	A
2019	not published	173	90.9	+90%	213 of 271	RINA	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Ro-ro 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 ro-ro 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.