BMW I3 And I8: Road Test, Range, And Key Differences

BMW’s i3 and i8 represent a bold step into the future of sustainable driving, combining cutting-edge electric propulsion with the brand’s signature engineering prowess. The i3 serves as an urban electric hatchback, while the i8 delivers supercar thrills through its plug-in hybrid system. Both vehicles leverage advanced carbon-fiber-reinforced plastic (CFRP) for lightweight bodies, enabling exceptional efficiency and agility. This road test delves into their real-world capabilities, from city streets to open highways.

Innovative Powertrains: Electric Purity Meets Hybrid Power

The BMW i3 prioritizes pure electric performance with a rear-mounted electric motor producing around 170-184 horsepower, depending on the trim. This setup propels the i3 from 0-37 mph in just 3.9 seconds and reaches 62 mph in 7.9 seconds, making it surprisingly brisk for a compact city car. Later models boosted output to 184 hp and torque to 199 lb-ft, enhancing zippy urban maneuvering.

In contrast, the i8’s plug-in hybrid integrates a 1.5-liter turbocharged three-cylinder engine (220 hp, 300 Nm) with front electric motors, yielding a combined 349-369 hp across all wheels. Acceleration hits 0-62 mph in 4.6 seconds, rivaling the BMW M3, with a top speed capped at 155 mph. Real-world tests confirm 0-60 mph in 4.1 seconds for the roadster variant, thanks to launch control.

Both offer electric-only modes: up to 22 miles for the i8 in urban conditions and expanded to 153 miles in updated i3s with a 42.2-kWh battery.

Lightweight Design and Aerodynamics

Central to both models is BMW’s LifeDrive architecture, using CFRP for the passenger cell atop an aluminum chassis. The i8 weighs just 1,480 kg—lighter than an M3 by 195 kg—while the i3 maintains supermini agility. This reduces battery weight impact and boosts range.

Aerodynamic shaping, including the i8’s butterfly doors and low drag coefficient, contributes to official efficiencies like 104.6 mpg for the i8. Real-world figures include 73.5 mpg with regular charging and 35 MPGe on highways.

Driving Dynamics: From City Nimbleness to Supercar Poise

BMW i3: Urban Agility Champion

The i3 excels in tight spaces with a turning circle under 10 meters, ideal for city driving. Its instant electric torque provides responsive low-speed acceleration, and stability shines in quarter-mile runs at 15.5 seconds and 90 mph. Rear-hinged doors enhance practicality despite the compact footprint.

• Immediate throttle response for traffic weaving
• Quiet, smooth EV operation
• Optional range extender for 200+ miles total

BMW i8: Grand Tourer with Sports Edge

The i8 transitions seamlessly from electric whisper to petrol roar, with the three-cylinder engine adding drama at higher speeds. It grips well without intimidation, behaving like a refined grand tourer. The roadster’s power top folds in 16 seconds, preserving performance.

• Refined launch with 12.6-second quarter-mile at 111 mph
• All-wheel drive for confident handling
• Low seating for sports car immersion

Interior Comfort and Technology

Cabins blend futuristic minimalism with BMW familiarity. The i3 offers four doors for accessibility, while the i8’s low-slung setup immerses drivers. Both feature high-quality materials, though the i8 has some plastic elements. Tech includes drive modes for EV prioritization and intuitive interfaces.

Efficiency and Range in Practice

i3 EPA ratings reach 113 MPGe combined, with no fuel tank needed in base models. i8 achieves 69 MPGe, with 18-22 miles EV range and low emissions (3.2 tons CO2 yearly). Charging discipline yields impressive savings.

Practicality and Ownership Considerations

The i3 suits urban dwellers with its compact size and low running costs. The i8, less practical for cargo or rear passengers, appeals to enthusiasts seeking efficiency with flair. Maintenance focuses on batteries and hybrids, but BMW’s build quality endures.

Pros and Cons at a Glance

Legacy and Market Impact

Launched as BMW’s i sub-brand flagships, the i3 and i8 pioneered mass-market CFRP and efficient powertrains, influencing modern EVs. Though production ended, used models offer value-packed performance.

Frequently Asked Questions (FAQs)

What is the main difference between BMW i3 and i8?

The i3 is a pure EV supermini for city use, while the i8 is a plug-in hybrid supercar blending electric and petrol power for sports performance.

How far can the BMW i3 drive on a single charge?

Updated models offer up to 153 miles, with range extenders pushing beyond 200 miles.

Is the BMW i8 as fast as traditional supercars?

It achieves 0-60 mph in 4.1 seconds but prioritizes efficiency over raw track speed.

Are these cars still available new?

Production ceased, but certified pre-owned options abound with warranties.

What fuel economy does the i8 really get?

Up to 73.5 mpg with plugging in; EPA 69 MPGe combined.