Not hybrid, but I went through all of this with my VW TDI Jetta. The car got an honest 47MPG average (best was about 53, I do most of my driving on the freeway, but I pushed the snot out of it on surface streets...jack rabbit starts with the tires chirping 'cause of the torquey (sp) engine) and I drove it about 180,000 miles before I gave it to my mother.
In real terms, factoring in maintenance, fuel costs, the premium charged for diesel cars, the car saved me about $1000 over that 180,000 miles/four years. That's comparing it to a car that gets 35MPG and assuming 100% depreciation (as it works out, the car is still worth a fair amount because TDIs are much sought after). A $250/yr savings is nothing to sneeze at, but neither is 180,000 miles either. By the time it is dead (250,000-300,000 miles) it will have saved more money (fuel prices are going up)... but then again how many people expect to drive a car even 150,000 miles?
The problem with the honda 7-yr warranty on the batteries is simple: who decides whether the battery is "dead"? NiMH batteries have very well understood properties... they can take about 1000 charge/deplete cycles before the capacity is cut in half. The exact numbers are researchable. What happens if the capacity is cut in half? Not much...the engine works harder and the fuel consumption goes down. So what they are saying is that in 7 years the batteries will not have shorted out or otherwise incapacitated the car... they aren't saying that the batteries will still help the car accellerate.
I've said it before... If I could get a decent european-style TDI, I'd buy it in an instant. A lupo is far nicer than an insight, and gets almost 90MPG...far better than the insight. And it is dirt simple... turbo charger, computer controlled direct injection diesel... can't get much nicer. I hear they make decent motorcycle engines.
