Well, I've had a pretty good sense of the differences since owning my diesel. As for towing, you'll never even come close with mileage and power. V10 is a great motor, but just doesn't have the torque of the diesel, and the mileage will be a huge difference.

Now, maintenance will be significantly higher, price wise, on the diesel. So, you have to take that into consideration, maintenance cost for the diesel, against what you would save in fuel mileage. If you tow enough, it will be worth it.