MPG

Prius Prime

Electricity (MPGe)

Electric Motor

145 city/121 hwy

Gasoline

1.8 4-cyl. Hybrid

55 city/53 hwy

Ioniq Plug-In Hybrid

Electricity (MPGe)

Electric Motor

123 city/114 hwy

Gasoline

1.6 4-cyl. Hybrid

53 city/52 hwy

Transmission

The Prius Prime has a standard continuously variable transmission (CVT). With no “steps” between gears, it can keep the engine at the most efficient speed for fuel economy, or keep it at its peak horsepower indefinitely for maximum acceleration. The Ioniq Plug-In Hybrid doesn’t offer a CVT.

Suspension and Handling

For better maneuverability, the Prius Prime’s turning circle is 1.4 feet tighter than the Ioniq Plug-In Hybrid’s (33.4 feet vs. 34.78 feet).

Passenger Space

The Prius Prime has .3 inches more front headroom and 1 inch more front legroom than the Ioniq Plug-In Hybrid.

Cargo Capacity

A low lift-over trunk design makes loading and unloading the Prius Prime easier. The Prius Prime’s trunk lift-over height is 26.5 inches, while the Ioniq Plug-In Hybrid’s liftover is 28.8 inches.

Ergonomics

The Prius Prime Limited has a standard heads-up display that projects speed and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Ioniq Plug-In Hybrid doesn’t offer a heads-up display.

The Prius Prime’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Ioniq Plug-In Hybrid’s standard passenger windows don’t open or close automatically. With the Ioniq Plug-In Hybrid’s optional power windows, only the front windows open or close automatically.

The Prius Prime Limited’s standard wipers adjust their speed and turn on and off automatically according to the amount of rainfall on the windshield. The Ioniq Plug-In Hybrid’s manually variable intermittent wipers have to be constantly adjusted.

While driving with high beams on, sensitive light sensors standard on the Prius Prime detect other vehicles which could be blinded and automatically switch to low beams. The Ioniq Plug-In Hybrid doesn’t offer automatic dimming high beams.

On extremely cold winter days, the Prius Prime Limited’s standard heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The Ioniq Plug-In Hybrid doesn’t offer a heated steering wheel.

The Prius Prime Limited’s Intelligent Parking Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The Ioniq Plug-In Hybrid doesn’t offer an automated parking system.

Recommendations

Consumer Reports? recommends the Toyota Prius Prime, based on reliability, safety and performance.

The Toyota Prius outsold the Hyundai Ioniq by almost six to one during 2018.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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