Drivers are becoming more reluctant to switch to electric vehicles from combustion engines and the trend is more pronounced in Europe than in the United States, a survey published by Shell showed.

The main obstacle is cost, according to the survey of 15,000 drivers across the world, including Britain, China, Germany and the U.S.

“Europe surprised us,” said David Bunch, Shell’s chief for mobility and convenience. “The single biggest barrier to entry is the cost of the vehicle. Range anxiety is still there but it’s diminishing.”

Electric vehicles are on average up to 30 percent more expensive than internal combustion engine cars.