On the decision making front, it would probably benefit you to look at what you want vs. what you need. Is your Prius deficient in any way, or is it simply not the latest and greatest from Toyota? More importantly, consinder why you bought the Prius in the first place. The fuel economy? If so, are you willing to take a substantial hit in FE? It may not matter much right now but consider your situation the next time fuel costs increase. How much more money will it cost yoou at $3 per? How about $4, which will be here eventually. Don't get me wrong, the TCH is far and away the best FE vehicle in its class. But its cababilities simply don't match the Prius that you already have.

Just consider the whole equation before you get carried away.