$6/gallon would be way on the high side estimate for mogas, so say $15 total, so we're sure to be generous.

Electric Pipistrel: "The cost of electricity per hour of flight is roughly between $4 and $6," said Krzysztof Będkowski of Pipistrel Alpha Poland."[2]

I can't work out how $4-6/$15 is 1/10. Is is attractive, for sure. Again, I'm not disputing electric is cheaper, but the claim of 1/5th the cost is pretty extraordinary.

[1] https://www.pipistrel-aircraft.com/aircraft/flight-training/...

[2] https://www.businessinsider.com/electric-plane-charges-in-ho...