Smart Fortwo CDI: 86mpg City Diesel With 1,000km Range

The Smart Fortwo CDI emerged as a game-changer in the compact car segment, boasting unprecedented fuel efficiency and tailored urban prowess. This diesel variant, powered by a refined 0.8-liter three-cylinder engine, delivered combined economy figures of up to 86 miles per gallon, positioning it as one of the most frugal production vehicles ever made.

Engineering Marvel for Urban Efficiency

At the heart of the Fortwo CDI lies a meticulously engineered 799cc turbocharged diesel engine producing 54 horsepower and 130Nm of torque. This setup excels in stop-start city conditions, where low-end torque provides responsive acceleration without excessive fuel use. Official figures cite 85.6mpg in extra-urban cycles, with combined economy reaching 86mpg, and CO2 emissions dropping to a mere 86g/km—earning it VED Band A status with zero first-year tax.

Smart’s engineers optimized the powertrain with tweaks like an integrated diesel particulate filter (DPF), ensuring compliance with stringent emissions standards while maintaining real-world efficiency. The lightweight 770kg kerb weight further amplifies these benefits, allowing a 33-liter tank to stretch over 1,000km in ideal conditions.

Compact Design Revolutionizing City Mobility

Measuring just 2.69 meters long, the Fortwo CDI slips effortlessly into the tightest parking spots, a boon for congested urban environments. Its rear-engine layout, with the powertrain positioned over the rear axle, delivers a 53:47 weight distribution that enhances stability and maneuverability.

Inside, the cabin maximizes space utilization: two full-size seats up front, a modest rear bench for occasional passengers, and a 220-liter boot that expands with seats folded. High-spec models like Passion and limited-edition variants added luxuries such as panoramic sunroofs, touchscreen infotainment with DVD/SD support, and premium floor mats.

Performance Tailored for Metropolitan Drives

Despite its diminutive size, the CDI achieves a top speed of 84-93mph (145km/h) and 0-62mph in 16.8 seconds, adequate for city zipping and occasional highway jaunts. The five-speed semi-automatic Softouch gearbox, while featuring a noticeable shift pause, prioritizes smoothness over sporting dynamics.

This table highlights the CDI’s balanced specs, favoring efficiency over outright speed.

Styling and Interior Refinements

The facelifted model introduced sharper exterior lines, including a bolder front grille, LED daytime running lights, and vibrant color options like the Lightshine edition. Interiors blended functionality with flair: high-quality plastics, supportive seats, and intuitive controls. Ambient lighting and upgraded audio systems elevated the drive, making commutes enjoyable.

Cabrio variants added open-air freedom, with a power-folding roof that maintained structural integrity. These updates broadened appeal, transforming the Fortwo from quirky novelty to desirable urban icon.

Real-World Ownership Experience

Owners praised the CDI’s miserly running costs—equivalent to pennies per mile—and ease of parking, often fitting where larger cars couldn’t. Maintenance is straightforward due to Mercedes-Benz backing, with shared parts reducing expenses. However, the firm ride over rough surfaces and gearbox lag drew criticism, particularly on twisty roads.

• Pros: Unbeatable economy, tiny footprint, low emissions.
• Cons: Firm suspension, semi-auto shift delays, limited practicality.

In city tests, it outshone rivals like the Toyota iQ in parking agility but lagged in rear space and highway composure.

Environmental Credentials and Innovations

With 86g/km CO2, the CDI set benchmarks for diesel city cars. It supported biofuels like Jatropha-derived diesel without modifications, showcasing forward-thinking flexibility. Compared to electric siblings (0g/km but range-limited), the CDI offered hassle-free long-range capability at 85.6mpg urban/extra-urban.

Comparisons with Contemporary Rivals

Versus the petrol MHD hybrid, the CDI edged in torque and range, covering 1,000km per tank. Against the electric Fortwo (275mpg equivalent, £1.70 charge), diesel won for unlimited range minus charging infrastructure woes. Larger foes like the iQ provided more seats but sacrificed the CDI’s extreme efficiency and parkability.

Long-Term Reliability and Market Legacy

Built from 2007-2015 (451 generation), these cars endure with proper DPF care—regular highway runs prevent clogging. Resale values hold for low-mileage examples, appealing to eco-conscious urbanites. Post-2014 models integrated micro-hybrid tech for idle-stop, boosting efficiency further.

YouTube reviews confirm durable engines, though rust and gearbox issues surface in high-mileage units.

Buying Guide: What to Look For

Target Passion or Pulse trims for best value. Check service history, DPF condition, and gearbox smoothness. Budget £3,000-£6,000 for solid 2010-2013 models. Avoid neglected examples with turbo whine or smoke.

1. Full Mercedes/Smart service records.
2. No DPF warnings or regen frequency issues.
3. Test drive for shift quality and engine noise.
4. Inspect for rust on sills and underbody.

Modern Relevance in a EV World

Though discontinued, the CDI’s principles—lightweight efficiency, urban focus—inform today’s micro-EVs. It proved diesel’s viability for cities pre-strict ULEZ rules, with running costs undercutting many hybrids.

Frequently Asked Questions (FAQs)

The Fortwo CDI remains a testament to smart engineering, blending fun, frugality, and form for the ultimate city companion.