Mercedes Benz GLS 2018 running costs in Ireland

Official figures — 2018 Mercedes Benz GLS

What it costs to run in Ireland

Assumes 15,000 km a year and the current average Ireland prices shown above (AA Ireland average, Sep 2026). Insurance is not included because it depends on your age, history and the policy — add it in the full ownership calculator. Servicing, tyres and repairs also vary by car and driver.

A 2018 Mercedes Benz GLS at different annual distances

Running costs scale almost linearly with distance: this car's certified 8.1 L/100km fixes the cost of every extra 1,000 kilometres.

Over five years at 15,000 km a year, fuel or electricity plus the NCT and road tax come to roughly €12,989; over ten years, about €25,978. Insurance, servicing, tyres and repairs are on top of that and are excluded throughout this page.

Is the 2018 Mercedes Benz GLS cheap to run? How it ranks in Ireland

Among the 5279 diesel cars with official figures in our Ireland dataset, the 2018 Mercedes Benz GLS is the 4592nd most efficient — 1 is the most efficient.

It uses 8.1 L/100km against a market median of 5.6 L/100km and a market average of 5.9 L/100km. The middle half of diesel cars sit between 4.5 and 6.9 L/100km. This car is therefore about 44.6% above the typical diesel car — worth roughly €1,041 a year more at 15,000 km a year.

What a 2018 Mercedes Benz GLS costs to run in other countries

The same car with the same certified consumption, priced at each market's own average fuel and electricity prices — so the differences below are local prices, not a different car.

Only markets that certify this exact model-year are listed, and fuel is compared like for like: road tax, insurance, the roadworthiness test and servicing are excluded because they differ by country. Euro conversions use ECB reference rates.

How it compares with other diesel cars in Ireland

The average diesel car in our Ireland dataset uses 5.6 L/100km. The 2018 Mercedes Benz GLS uses 8.1 L/100km — about 44.6% more than that average, or roughly €720 extra a year at 15,000 km.

2018 Mercedes Benz GLS — configurations in the official data

Figures are the official certified values recorded in the UK VCA merged archive, grouped across 2 configurations. Real-world consumption is typically higher than the certified figure, and NEDC-cycle figures are optimistic compared with the newer WLTP cycle.

2018 Mercedes Benz GLS running costs — frequently asked questions

How much does a 2018 Mercedes Benz GLS cost to run in Ireland?

About €2,598 a year (€216 a month) at the market average price of €1.92 per litre of diesel. That is €2,333 of fuel or electricity plus €55.00 for the NCT and €210 of road tax. Insurance, servicing, tyres and repairs are not included.

How much does a 2018 Mercedes Benz GLS cost per kilometre to run?

€0.16 per kilometre (€0.25 per mile) in fuel or electricity alone, based on the certified 8.1 L/100km and Ireland average diesel prices.

What is the fuel consumption of a 2018 Mercedes Benz GLS?

The official certified figure for this model-year is 8.1–12.3 L/100km, with CO₂ of 203–288 g/km. Source: UK VCA merged archive, NEDC test cycle. Real-world consumption is usually higher than the certified figure, and NEDC figures are optimistic compared with WLTP.

What are the CO₂ emissions of a 2018 Mercedes Benz GLS?

203–288 g/km CO₂ on the NEDC test cycle, according to UK VCA merged archive. CO₂ is what determines the exact road tax band for the specific variant — the €210 figure used on this page is the Ireland national average, so check the band for the exact car you are buying.

Is the 2018 Mercedes Benz GLS cheap to run compared with other diesel cars in Ireland?

Yes, in relative terms: it ranks 4592 of 5279 diesel cars in our Ireland dataset, where 1 is the most efficient. It uses 8.1 L/100km against a market median of 5.6 L/100km — about 44.6% more than the typical car, or roughly €1,041 a year extra at km the market default.

Where is a 2018 Mercedes Benz GLS cheapest to run?

Of the markets that share this car's certified data, Sweden works out cheapest at about SEK 23,437 a year and United Kingdom the most expensive at about £2,910 — the difference is local fuel and electricity prices, not the car. Figures are converted at ECB reference rates and exclude tax, insurance and servicing, which differ by country.

How the 2018 Mercedes Benz GLS running costs are calculated

Every figure on this page is calculated from official certified data — nothing is estimated, and no figure is carried over from a similar car:

• Consumption and CO₂ are the certified values recorded in UK VCA merged archive, measured on the NEDC test cycle, taken across the 2 configurations held for this model-year.
• Annual cost is consumption × distance × the market's current average price for diesel, at 15,000 km a year.
• The roadworthiness test and road tax use the Ireland national figures shown above. Road tax is banded by CO₂ in most markets, so the exact rate depends on the variant you buy — the figure here is the market average, not a quote for one registration.
• Deliberately excluded: insurance, servicing, tyres, repairs and depreciation. They depend on the driver, the policy and the individual car, so putting a number on them would mean inventing one.

To price a specific car with your own distance and local prices, use the full running-cost calculator for Ireland.

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