I've made this trip a couple times (in a 60). Here are some options:
1. Slow down. If you're in a 70-85 kWh model this should be a fairly easy leg . If you're in a 60, you can make it but you have to maintain 60-65 mph (and be willing to go below that if required) and be adventurous.
2. There are RV parks all along I-10 that you can call an arrange a quick stop to add ~30 miles an hour. I hit a couple a while back that I can recommend as "EV friendly." I can check my map in the car later for the names, as I don't recall them right off hand.
3. Buy or borrow a CHAdeMO adapter if you don't already have one. There's a Rouses Market in New Orleans that has a CHAdeMO adapter (free). Call ahead to make sure it's working, and then keep your fingers crossed that it doesn't overheat. I had to remove the inside filter completely to get it to not overheat on me. This also adds time and miles, since you have to detour down I-10 instead of taking I-12.
So, in a 85 I'd go with option 1 (you shouldn't have to slow down that much to make 195 miles). In a 60, I'd go with option 2, as RV parks would be much more reliable (a lot of outlets) than 1 single fast charger in NO.
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Yes--what TexasEV said. I guess I type too slow.