The conversion for eMPG (which yes, is possibly the most cursed of units) is ~33 kwh equals a gallon. My PNW home electricity prices are pretty low, but that puts an eGallon at ~$2.97.
If anything I think that number is misleadingly high, but that’s part of why it’s possibly the most cursed unit.
It’s absolutely a gimmick markup, but as gimmick markups on gravestones go that’s not that expensive. Not because that’s reasonable but because there’s so much guilting people into spending at least 4 figures while they’re grieving.