I just had a flat tire in my PHEV, and am not impressed with the flat sealant and compressor supplied with the new Prius. Somehow, in a 10-mile trip on the Interstate, my rear right tire suffered a cut to the side of the tire, almost at the sidewall, rendering it impossible to re-inflate with the compressor and tire sealant. In the process of trying to re-inflate, before I could see where the hole was, I managed to pump the entire bottle of sealant onto the pavement. The hole sealed somewhat for about 10 miles but then leaked, leaving my tire flat again. This morning I had to call Toyota Roadside Assistance, and after almost 4 hours, I have a new tire (at $167) and had to order a new bottle of sealant, which was an additional $150. I really dislike not having a spare tire; my confidence in this car for long trips has just taken a huge hit. No longer can I reasonably assume that I can get going again after a flat tire; not only that, but I had to buy the new tire and replace the sealant, whose usefulness was nonexistent. To make matters worse, there were no tow bars in the car; we found one at the dealership in a new Scion, but mine had none to be found. Not a big deal, but there should have been at least one in the car. I know that nothing can prevent a slice to a sidewall, but having no spare meant a four-hour process with a tow truck; had there been a spare, I could've been back in business in 15 minutes, driven to a local tire dealer, and gotten a new tire in about an hour.