Ok, so check this out:
http://www.gfchips.com/chevroletvolt.aspx?

At first I thought this was an error on their website. It looks like they have the same language for every chip and just <insert vehicle make/model> throughout their boiler plate text. I've used tuner chips in the past on my Mustangs, but did not expect to see them so soon for something as advanced as the Volt. So I called them up and they confirmed this is a real product! They said they are making some final improvements and they will be ready to ship in about 4wks. They said there will be a news release as well.

They claim the chip will improve horsepower and gas milage while reducing emmisions. So I asked them if that meant the chip only helps out when the ICE is running? They said no, that it also improves performance in EV mode and that they're working on several EV chips besides the Volt! I'm skeptical, but curious. Any volunteers willing to be the guinee pig and test this

I'm particularly interested in what WOT thinks and has to say about this mod. WOT? I'm not sure I'd risk my warranty.

From their site:
Manufacturer Part Number: 103077
MSRP$399.99
Your Price: $69.00

WHAT IS IT? The GF Performance Chip reprograms your air/fuel ratio, ignition timing, and other aspects of your vehicle's engine to SAFELY increase the power, while increasing fuel economy significantly. Our chips are designed and programmed per vehicle. Your car will run smoother, run cooler and more efficiently at the same time. The gains we advertise are real, and are guaranteed with a money back promise. Our chips will not only increase horsepower, but torque as well for more REAL power. It increases power throughout the full RPM range unlike many competitors.

EASY INSTALLATION. Installation can be performed by anyone using simple hand tools. The GF module installs into your CHEVROLET VOLT's engine bay and is connected via 2 wires that plug into the IAT sensor. Diagrams are included. The unit is then able to reprogram the ECU thus improving your car's performance. Everything needed for installation is included in this kit for a quick and easy installation that shouldn't take more than 15 minutes. There is absolutley nothing else needed to have this installed on your vehicle.

COMPATIBLE. The GF Performance Chip utilizes the latest in automotive engine control technology. Our product allows you to take your CHEVROLET VOLT's performance to the next level. Our product is tested to work with your car in either stock or modified trim. You can have any kind of modification and our unit will still remain compatible with your CHEVROLET VOLT.

GUARANTEED. Regardless of your driving style our chip will provide a substantial increase in performance in your CHEVROLET VOLT. All of these benefits are achieved without disassembling your CHEVROLET VOLT's ECU thereby preserving your factory warranty or permanently altering your car in any way shape or form. What sets us apart from our competition is that we offer a solid product that we stand by, so much so that if you are not satisfied in any way we will offer you a 100% no questions asked refund. Additionally, just from the fuel savings alone, our chip pays for itself!