While perusing the U.S. Patent and Trademark Office application database, we stumbled across a filing from General Motors for a system to automatically deliver additives to the fuel tank of a plug-in hybrid vehicle. While the application mentions engines with a variety of fuels and several possible additives, this clearly seems like something applicable to the Volt. The system would have a controller to determine when and how much of an additive to deliver.
If a PHEV was regularly used for longer trips with the engine running, a fuel stabilizer would be unneeded, but if the controller detected a lot of short EV trips and the engine didn't run for weeks or months it could add stabilizer periodically. GM officials have not responded to a request for comment on whether we might see this functionality in the Volt.
[Source: U.S. Patent and Trademark Office]