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The project, launched last August, examines how long the vehicles can run on one charge, how cost effective they are and how they perform in different conditions.
Experts said results of the study, being run by Jewel and Esk College, will be crucial to the vehicles becoming a viable option for motorists.
Researchers said they want to build public confidence in electric cars and ultimately make them “mainstream” across Scotland.
Four cars were initially distributed in Edinburgh and Dalkeith but a further five have since been put into use. Three charging points have been built by students and staff at the college.
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