Smaller 20-inch wheels improved the Ioniq 5 N’s highway efficiency by about 12%. Similar Tesla tests show smaller wheels can deliver meaningful EV efficiency and range gains. This means you can increase your vehicle’s range by equipping it with smaller wheels and more efficient, lower-rolling-resistance tires. Matt from the Downshift YouTube channel wanted to give his Hyundai Ioniq 5 N more range, because it only has an EPA-rated range of just 221 miles. On the same 30-mile loop, the Ioniq 5 N returned 3.7 mi/kWh, but he noticed a clear improvement while driving on the highway.