California's state excise tax is the highest in the entire country, add sales tax and that's .72 JUST from California taxes. Not done yet. C&T and LCFS (Google them) both add additional costs for the California Air Resource Board. California ALSO adds fuel standards stricter than the EPA, which also raises costs and causes higher logistical cost that you also pay at the pump. Theres more garbage tossed in there too, look it up. $6 by Gavin's choice, not Federal.
Don't make Grok your main model on Hermes, it's not there yet. Not even close. It will screw your projects up though and tell you everything is fantastic!