Parking in Venice, a better way?

Take the train and ditch the car. You won't need it and as you're finding out, parking is expensive. Donna

I agree with Donna. Depending on how long you've had the car, you can always re-rent a car as you leave Venice if travel by car is warranted. Just be careful of the speed radar cameras on the causeway out of and into Venice.
When we drove into Venice 4/2012, gasoline was a whopping $9.51 per U.S. gallon. That would make anyone second think about renting a car in Europe.

Don't be short-sighted. Compare the parking cost with one longer-term rental to two potentially more expensive short-term rentals. Gas will be more expensive, but you'll probably have a car with excellent mileage and distances tend to be short. Gas from Rome to Venice would be something on the order of seventy-five dollars.

Don't be short-sighted. Compare the parking cost with one longer-term rental to two potentially more expensive short-term rentals. A good point. Though better yet, try and arrange your trip so that you don't need a car before AND after the visit to Venice. Paying for a rental car you don't use and still must pay to park is very inefficient.