A new Electric Vehicle Outlook Study by Investor’s Business Daily and TechnoMetrica found 60% of car buyers today would be interested in a vehicle running on alternative fuel for their next new purchase. That’s up seven percentage points from a similar study done in 2014.

Younger drivers are the most enthusiastic about electric cars, while older and middle-income Americans are “starting to embrace” EVs, according to TechnoMetrica.

But consumers still have concerns, according to the survey. Among them:

Range anxiety.

Buyers worry about running out of power and don’t want to find themselves stuck on the side of the road with nowhere to plug in.

Charging distance.

Consumer want EVs that can run for more than 270 miles on one charge that takes less than to two hours and they want the vehicle to cost no more than $30,000, according to the survey.

No electric car on the market today can do that, but they’re getting close.

Charging stations

How many and where are they?

The availability of charging stations was the No. 2 factor in consumers’ decision to buy or not to buy an electric car, behind range.

The U.S. now has roughly 22,000 public electric-vehicle charging stations with more than 68,800 charging units or outlets, according to the Energy Department. That’s up from 16,000 charging stations and 43,000 units two years ago.

Charging time

Consumers’ patience is also wearing thin on the acceptable wait times for charging EV cars, according to the study.

Charging speeds are categorized in three levels. At Level 1, a Hyundai Kona would take up to 60 hours to fully charge. It would take six hours at Level 2 and less than one hour at Level 3.

However, Level 3 chargers are costly and represent just 16% of connections at U.S. public charging stations.

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