Not to get off subject but I can give some feedback on this comparison. I commute 40 miles to work through some sizeable hills and flat land in southern WI. I had a '05 diesel Jetta I bought new and put 140k on before I sold it to buy a used '10 Prius. I sorely miss the Jetta. It kicked the crap out of the Prius in torque and overall mileage. The Jetta would get 49 mpg in the summer and 44 mpg in the winter. Was fun to drive, but the lack of a local dealership kept me from getting a new one. The Prius gets 47 mpg in the summer and 37 mpg in the winter. I just took it on a 8 hour trip to Duluth and it got 33 in the cold and headwind. The Prius really suffers in the cold and hills. Toyota tells me the batteries really lose their efficiency in the cold. I think the Prius would be best in stop and go driving, but the diesel Jetta was king in the highway commute department, at least for me. I still wish I could get an economical diesel commuter without all of the emission b.s. on it.