I was going to NEW about 3 weeks ago and canceled due to weather.
I was planning to park at aeropremier Jet Center. Fuel prices were found by using AirNav.com
In the past, I have never had a problem going from NEW airport to downtown New Orleans.
Note, I almost never rent a car. I usually take a cab and walk or take a bus, or trolley, or other rail into a city. A car is just an accident waiting to happen. Parking is also a major pain.
Granted there are exceptions, but usually I take a cab.