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Renault Introduces Its Lowest CO2-Emitting Production Car; 98 g/km

The Clio dCi 85 Renault eco2. Click to enlarge.

Renault introduced its lowest CO2-emitting production car yet ahead of the Brussels Motor Show. The new version of Clio dCi 85 Renault eco² produces 98 grams CO2 per kilometer, corresponding to combined cycle fuel consumption of 3.7 liters/100km (63.6 mpg US) and a theoretical range of 1,486 km (923 miles).

A series of changes to the engine and the rest of the vehicle resulted in a significant reduction in CO2 emissions of 17 g/km (an improvement of 15%) without any impact on the punch of the vehicle.

Renault’s engineers focused particularly on fine-tuning the dCi 85 diesel powerplant in order to achieve the greatest possible improvement in CO2 emissions levels without any compromise in performance. Among the changes are:

  • Longer gearing across all the transmission ratios: the torque and the flexibility of the dCi 85 allow this to be achieved without any significant impact on performance.

  • Reduction of frictional losses in the engine and gearbox with the introduction of low-viscosity lubricants.

  • Dedicated engine mapping focused on reducing fuel consumption and CO2 emissions.

The Euro 4-compliant 1.5-liter engine delivers maximum power of 63 kW (85 hp) @ 3,750 rpm and maximum torque of 200 N·m (148 lb-ft) @ 1,900 rpm, with a compression ratio of 17.9:1. The engine is matched with a 5-speed gearbox. Top speed is 176 km/h (109 mph). The vehicle is equipped with electric variable rate power steering.

To reduce rolling resistance and drag, Renault extended the flexible lip under the front bumper by 15mm and added front wheel arch liner extension flaps and a specific underbody enclosure for rear axle. These aerodynamics-related improvements had no adverse effect on Clio’s looks, Renault said, and were achieved without use of intrusive solutions as a rear lip spoiler or full disc wheel trims.

The car is also fitted with Michelin 185x60 R15 low energy consumption tires. Taken together, these changes bring about a 5% improvement in CdA, taking it from 0.725 to 0.690 and directly benefiting the vehicle’s CO2 emissions. The reduction of 17 g/km has been achieved without any impact on driving pleasure, comfort or noise levels, Renault said.

The new version of Clio will sell at the same price as the 115 g/km version, a further sign of the Renault eco² signature’s bid to make ecological and economical vehicles available to as many motorists as possible.

Renault is also introducing a new gasoline engine in the Clio, a Euro5-compliant TCe 100 with CO2 emissions reduced to 129 g/km, representing a gain of 8 g/km.



It really is taking the mickey when the car manufacturers announce a 15% reduction in CO2 emissions like this for virtually no extra cost and no amazing technological leaps or investment on their part, given how bitterly they complained just a couple of years ago that it couldn't be done without adding $3,000 to the price of every car.

VW have done it with the bluemotion versions, BMW with efficient dynamics and Vauxhall with the ECO4. Just goes to show how little they have cared about fuel economy until now.



and there is more to come, this car doesn't have a start and stop and a regenerative braking alternator. Weight reduction and aero can be improved by a significant amount. Engine still have a margin of improvment. 5 years from now they will be close to 80MPG. So that will make life harder for EV...


Clett and Treehugger:

You are both correct.

All what is required is government regulations and standards + strict applications + high enough penalties. If it is done worldwide, lobbies could not do much to stop it.

A 100+ mpg CAFE standard could be applied by 2022/2025. Mass produced PHEVs, with smaller lighter gensets, could easily do it by 2015 at acceptable extra cost.


You all three are right; however, I believe by 2020, because of the leaps in battery technology and clean energy power plants, the majority of the autos will be BEVs.

Will S

Both Renault and Peugeot appear to be on track to making the cars that will survive when gas prices go over and beyond $3/gal.


Will S: where I live (UK) gas is $6.88 per US gallon ($1.81 per liter). Enjoy your sub-$3 gas!


Aerodynamics is almost an afterthought, adaptive areodynamics which can close the air flow to the cooling systems while the engine is heating up.

Electrification of systems so the car can function with the engine off are a natural stepping stone allowing gliding.
Brake energy recovery/lauch boosting will help save the life of the brakes as well as increase mpg.


It is very impressive. It just shows what a clear push from the EU can do (the market is too variable and short term).

Also, as JN2 has pointed out, we have had expensive fuel in the EU for decades, and the cars have not been THAT much better than the US cars.

It is the steady pressure from the EU that has done it (+ green bragging rights).

As Tree has pointed out, there is still a lot they can do - stop/start and brake regeneration, so we can see further reductions in the years to come without any engineering breakthroughs, the only problem will be price.
The Clio is a low cost car, and the trick is to bring in fuel saving measures without making it too expensive (and they seem to have done this).

So well done Renault.


"All what is required is government regulations and standards + strict applications + high enough penalties. "

Harvey, you place way too much faith in bureaucrats who have little or no supervision. Also your lexicon is an apt descriptor of your psychology:


Societies operated under these terms are often called totalitarian or Orwellian - government controls all. This will not happen in the U.S. without blood being spilled. Be assured.


It also demonstrates what more ambitious fuel economy / CO2 emission regulations can achieve compared to the blunt instrument of fuel taxes.

Lets not forget the reason why the UK government rose gas taxes - to encourage us brits to buy more fuel efficient vehicles. Well, at least that's what they said in 1992 to introduce the fuel duty escalator (of at least 5% per annum rise above inflation in tax) yet there was no real dent in fuel efficiency unitl the fuel economy / CO2 targets were introduced. Why? because there were no targets to encorurage the production of more energy efficient vehicles.

Shows how much fuel taxes are a scam to raise revenue and not being a genuine environmental policy.



Nations cannot exist a long time without appropriate regulations. Western cowboys had their days.

Free for all economies end up with major financial crisis (bubbles) every decade or so. Have a look at what happened in USA during the last century and specially during the last 40 years. Frequent bursting bubbles have become the norm and affecting the whole world.

You cannot let Wall Street operators and speculators embezzle $$$B/year in tax free bonuses and huge profits forever.

EU is trying to introduce more regulations to stabilize their economies. USA will have to do it too if it wants to survive for another century.

Coal, Oil, Banking, Insurance and Wall Street operators appetite will have to be restrained. Their huge profits and bonuses will have to be taxed more. Public $$$B cannot be used every 10 years to save them from repeated self created bankrupcy.

Ole Grampa

@ HarveyD:
What a knee jerk liberal fool you are.
The United States DOES have appropriate regulations.
That's why we have far less graft in this country, for example. We have not had a 'free for all' economy for about 75 years. We have the second highest corporate taxes in the developed world, and we have plenty of regulations.
How's this for a reality check: huge tax bonuses are not instances of embezzlement, and these bonuses are also NOT the cause of the banking collapse.
One cause was the following unfortunate regulation: forcing banks to loan money to people who couldn't pay it back.

There have been lots of fuel-efficient cars sold here. I drive one. Honda insight, jetta tdi, prius, etc. Without regulations.

'Western cowboys had their days' - how utterly simplistic and infantile.

This forum is for people who are interested in alternative energy technologies, not stupid liberal politics. Go away.


@ John Thompson:
What a knee jerk conservative fool you are.
The United States DOES NOT have appropriate regulations.
That's why we have far more graft in this country, for example. We have had a 'free for all" economy for about 175 years. We have the third lowest corporate taxes in the developed world (ex: Ireland and Switzerland), and we have a paucity of regulations.
How's this for a reality check: huge tax bonuses are instances of embezzlement, and these bonuses ARE part of the cause of the banking collapse. One cause was the following unfortunate internal bank policy: grifting borrowers into pay banks usurious interest rates, knowing full well that the people couldn't pay it back.

There have been lots of fuel-efficient cars bought here. I don't drive one. Ford Leviathan, GMC Gargantua, Dodge Colossus, etc. With regulations.

'Western cowboys had their days' - how utterly profound and sage.

This forum is for people who are interested in Energy, Technologies, Issues and Policies for Sustainable Mobility, not stupid conservative politics. Come again some other day.



Here we discuss ideas, not attack people. Sometimes politics gets into the discussion because it forms policy for the better or worse, that can not be helped. But we try to stick to the policies that will make cleaner more efficient cars, not attack people so that we can make others believe what we believe, that is fascism.


Technologies are here to build 100+ mph affordable cars. Many (millions) will be on the market before the end of this decade.

Who will build most of those 100+ mpg vehicles is a fair question. Will it be New GM with Volts +++, Toyota PHEVs, BYD, Nissan, Ford, Hyunday, Honda, VW, Peugeot, Renault, Fiat etc. All those large manufacturers could do it by 2015/16.

If all major manufacturers can do it, the CAFE standard may have to be raised to 100+ mph shortly thereafter.

One thing is certain, manufacturers will not spend the $$B required to drastically change their products unless they are forced to do it.

Governments have the essential tools required in CAFE and GHG standards. They just have to be regularly updated and applied.

@ John Thompson:

JC's answers are adequate for me. Anarchy and lawlessness is not my bag.

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