Their data is smelly, from a quick computation from EPA.gov ( https://www.fueleconomy.gov/feg/Find.do?action=sbs&id=46356&... ): a Nissan Versa gets so ~2.9 gallons for 100 miles, a Bolt 29kWh / 100 miles, at $5.025 a gallon (current California gas rates) and $0.26 a kWh (PG&E rate) that'd be ~$14.6 vs ~$7.26.

If you compare instead in Texas at ~$3.4 a gallon / $0.14 a kWh, $9.86 / $4.06.