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In-depth reviews

Mercedes E-Class review - MPG, CO2 and Running Costs

New 2.0 diesel improves CO2 emissions to class-leading levels

Not only is the 2.0-litre diesel in the E 220 d faster and more refined, it’s also more efficient. Combined fuel economy is 51.4mpg under the new WLTP regime. Also, on the SE model’s standard 17-inch wheels, CO2 emissions are now 122g/km, meaning the all important 2018/19 Benefit in Kind (BiK) tax rate for company car drivers is 29% per cent. This is almost identical to rivals such as the Audi A6 Ultra S tronic, BMW 520d SE auto and Jaguar XF 2.0d auto.

Opt for the E 400 d and the vital figures aren’t quite as impressive, with the E-Class offering 39.8mpg and 157g/km CO2, but this is still competitive efficiency compared to its rivals and good considering the level of performance on offer.

The E 53 AMG manages 30.7mpg and 200g/km of CO2, which is impressive for such a powerful motor - but in the real world those figures will be some way off, especially if you're driving it as intended.

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The E 300 e and E 300 de are the most efficient of the bunch, each emitting between 41 and 46g/km of CO2. The E 300 e has an official fuel economy figure of 37.2mpg, but remember that if you can make use of its 30-mile electric range then you won't use a single drop of fuel. The E 300 de has a higher official figure of 48.7mpg, but the same all-electric rules apply.

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All cars get stop-start to help reduce tailpipe emissions, while other features such as clever aerodynamics further improve efficiency. The new E-Class has a drag coefficient of 0.23 Cd, which is actually 0.01 lower than the latest Toyota Prius, an already very aerodynamically advanced vehicle, showing how well the Merc slips through the air, using less fuel in the process.

Private buyers will have to do their sums carefully to avoid paying too much road tax. Entry level E220d models come in under the £40,000 road tax threshold, although adding Premium Packs can tip this over the edge, meaning road tax rises from £145 to £465.

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Servicing costs will be similar to other models in the Mercedes line-up. With service intervals of 15,500 miles or one year (identical to the S-Class), Mercedes offers a three-year/three-service maintenance package on the new E-Class for about £37 per month, working out to £1,332 overall.

Insurance groups

The entry-level E 220d SE is rated at group 31 and going for AMG Line trim doesn’t increase this rating. Official insurance groups for the E 400 d are yet to be announced, but we expect it to be more expensive due to the extra performance on offer.

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Insurance groups are also yet to be confirmed for the E 300 e and E 300 de plug-in hybrids but, because of their more expensive technology, they will more than likely be higher due to factors such as increased repair costs following a crash.

Depreciation

With predicted residual values hovering around 45 per cent according to our experts, the new E-Class is on a par with rivals when it comes to depreciation.

The entry-level E 220d SE will hold onto 45.2 per cent of its value, making it one of the stronger models in the range.

AMG Line models are likely to be more desirable on the second-hand market due to the extra standard kit and sportier looks, although there’s not too much difference in expected used prices between these and SE versions, so whichever E-Class you go for, you’ll lose around the same proportion of the price as you would on an Audi A6.

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