Most Emission-Efficient Oil Tankers
Ships ranked by AER (Annual Efficiency Ratio) — grams of CO₂ emitted per tonne of deadweight carried one nautical mile (g CO₂/dwt·nm), the IMO carbon-intensity metric behind the CII rating — from official EU MRV emissions data for reporting year 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 1 |
FRONT PRINCE
IMO 9788899
|
301,187 | 2017 |
1.3
|
A |
| 2 |
MARIA A. ANGELICOUSSIS
IMO 9930789
|
320,916 | 2023 |
1.5
|
A |
| 3 |
ADAMANTIOS
IMO 9905447
|
299,983 | 2020 |
1.6
|
A |
| 4 |
ADVANTAGE VITAL
IMO 9933561
|
299,590 | 2023 |
1.6
|
A |
| 5 |
MARAN DIONE
IMO 9930806
|
320,916 | 2023 |
1.6
|
A |
| 6 |
MARAN DANAE
IMO 9930791
|
320,916 | 2023 |
1.6
|
A |
| 7 |
SEAWAYS ENDEAVOR
IMO 9933573
|
299,365 | 2023 |
1.6
|
A |
| 8 |
EAGLE VENTURA
IMO 9933614
|
299,407 | 2023 |
1.6
|
A |
| 10 |
ADVANTAGE VERDICT
IMO 9933535
|
299,451 | 2022 |
1.7
|
A |
| 9 |
FRONT EIRA
IMO 9855331
|
299,995 | 2019 |
1.7
|
A |
| 11 |
LONDON VOYAGER
IMO 9834454
|
318,608 | 2019 |
1.7
|
A |
| 12 |
FRONT TWEED
IMO 9920784
|
299,986 | 2022 |
1.7
|
A |
| 14 |
NEW SPLENDOR
IMO 9911991
|
307,468 | 2023 |
1.7
|
A |
| 13 |
ASCONA
IMO 9828338
|
299,999 | 2019 |
1.7
|
A |
| 16 |
ANTONIS I. ANGELICOUSSIS
IMO 9930777
|
320,916 | 2023 |
1.7
|
A |
| 15 |
FRONT GANDER
IMO 9937098
|
300,018 | 2023 |
1.7
|
A |
| 17 |
EAGLE VELLORE
IMO 9933602
|
299,554 | 2023 |
1.7
|
A |
| 18 |
VL BRILLIANT
IMO 9683673
|
319,300 | 2014 |
1.7
|
A |
| 20 |
NEW WEALTH
IMO 9706384
|
318,455 | 2017 |
1.8
|
A |
| 19 |
NEW PROSPERITY
IMO 9689988
|
318,329 | 2015 |
1.8
|
A |
| 24 |
ESTEEM ASTRO
IMO 9838008
|
312,105 | 2015 |
1.8
|
A |
| 21 |
NEW VISION
IMO 9799202
|
307,205 | 2019 |
1.8
|
A |
| 25 |
ADVANTAGE VICTORY
IMO 9933547
|
299,468 | 2022 |
1.8
|
A |
| 23 |
YUAN FU YANG
IMO 9843314
|
319,667 | 2021 |
1.8
|
A |
| 22 |
YUAN GUI YANG
IMO 9843302
|
319,701 | 2020 |
1.8
|
A |
| 26 |
MARAN APHRODITE
IMO 9810381
|
319,398 | 2018 |
1.8
|
A |
| 28 |
NISSOS KEROS
IMO 9856074
|
318,953 | 2019 |
1.8
|
A |
| 27 |
MORNING HOPE
IMO 9789283
|
300,927 | 2015 |
1.8
|
A |
| 29 |
OLYMPIC LUNA
IMO 9731157
|
299,337 | 2017 |
1.8
|
A |
| 31 |
FRONT DISCOVERY
IMO 9830109
|
298,952 | 2019 |
1.8
|
A |
| 30 |
OLYMPUS
IMO 9941661
|
301,850 | 2023 |
1.8
|
A |
| 32 |
EAGLE VERSAILLES
IMO 9597276
|
320,500 | 2013 |
1.8
|
A |
| 33 |
ALMI ATLAS
IMO 9816323
|
315,221 | 2018 |
1.8
|
A |
| 36 |
AGIOS NIKOLAS
IMO 9845506
|
363,186 | 2019 |
1.9
|
A |
| 35 |
NISSOS KYTHNOS
IMO 9853852
|
318,744 | 2019 |
1.9
|
A |
| 34 |
SEAWAYS GIBBS HILL
IMO 9885594
|
299,942 | 2020 |
1.9
|
A |
| 38 |
FRONT TANA
IMO 9933640
|
299,988 | 2022 |
1.9
|
A |
| 37 |
SANAM
IMO 9858486
|
299,999 | 2020 |
1.9
|
A |
| 40 |
DHT APPALOOSA
IMO 9826122
|
318,918 | 2018 |
1.9
|
A |
| 39 |
AMAD
IMO 9783693
|
298,705 | 2018 |
1.9
|
A |
| 41 |
ADVANTAGE VISION
IMO 9933559
|
299,455 | 2023 |
1.9
|
A |
| 43 |
SEAVOICE
IMO 9877755
|
299,989 | 2020 |
1.9
|
A |
| 42 |
FRONT ALTA
IMO 9920772
|
299,979 | 2022 |
1.9
|
A |
| 44 |
CASPAR
IMO 9926661
|
299,847 | 2022 |
1.9
|
A |
| 45 |
SEAWAYS ENTERPRISE
IMO 9933585
|
299,365 | 2023 |
1.9
|
A |
| 47 |
FRONT DUCHESS
IMO 9771341
|
299,441 | 2017 |
1.9
|
A |
| 46 |
HUNTER
IMO 9896414
|
299,940 | 2021 |
1.9
|
A |
| 50 |
FRONT OSEN
IMO 9728708
|
298,991 | 2016 |
1.9
|
A |
| 49 |
FRONT EARL
IMO 9788320
|
303,121 | 2017 |
1.9
|
A |
| 48 |
KASSAB
IMO 9783710
|
298,721 | 2018 |
1.9
|
A |
Which engines power the greenest fleets?
The main engine is the single largest CO₂ source on board — typically well over 80% of a ship's emissions come from propulsion. We aggregated this ranking the other way around: every engine design is scored by the measured carbon intensity of the vessels carrying it, licensee-built units merged under their design brand. The verdict from the 2025 data — modern dual-fuel designs like MAN B&W's ME-GI and WinGD's X-DF families, together with EGR/SCR-abated and ultra-long-stroke G-type engines, consistently power the most emission-friendly ships in service.
AER (Annual Efficiency Ratio) = annual CO₂ emissions ÷ (deadweight × distance sailed), the IMO carbon-intensity metric used for CII ratings. It is built only from measured CO₂, distance and deadweight — not the self-reported cargo transport-work figure, which is unreliable. Implausible outliers (top 2% per segment) are excluded. Grade A–E reflects each vessel's rank within its segment. Source: EMSA THETIS-MRV.