The Prius shut down, stopped using gasoline power, while I was in the passing lane and traveling 70 miles per hour in moderate traffic on interstate 40 in nashville, tn. The red triangle, check engine, vsc and a few other warning signals illuminated. I managed to avoid being rear-ended, pulled to the side of the road using battery power, shut the battery power off, and consulted the owner's manual. Approximately 10-15 minutes prior, the add fuel light illuminated and the fuel indicator displayed a single bar. Having driven the vehicle for the past 8300 miles, my wife informed me that we had about 2 gallons of gas, and could easily travel another fifty miles. The temperature was near 90 degrees. I started the vehicle and chose to drive it off the interstate. We traveled 2.5 miles and coasted to the side of the road as the battery depleted. I managed to slowly drive the vehicle to a gas station and refueled. The fuel tank could only accommodate 8.1 gallons of fuel; it holds 11.7. once refueled, the warning signals disappeared after 30 seconds, and we drove home. My wife took the car to the dealer, joe heitz Toyota in clarksville, tn, the next day for an evaluation. The mechanic said that the computer indicated that the vehicle ran out of fuel. Since there obviously was fuel in the tank, I pressed the service manager for answers. By the end of the day and after consulting with Prius technical folks in California, the service manager said that the fuel bladder may have collapsed over the sending module thereby signaling the car's computer that it was out of gas, which caused it to shut down. He said Toyota is looking into the problem and provided a lame solution; refuel the vehicle before it gets too low. This is an unacceptable answer and I implore the NHTSA to investigate this potentially deadly anomaly. It is only a matter of time before someone is in a fatal accident because the vehicle shuts down while traveling at interstate speeds.

- Ashland City, TN, USA