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I'd replace that one tire with or maybe both fronts with Michelin Pilot SS in your (I think) 225/40r19 size.
It has rolling diameter of 26.1 which is same as your 255/35r19 rear Pirelli when new.
Your Pirelli P Zero 225/40r19 front has 25.9 diameter new.
You don't have much leeway to put different tires on 19 inch wheels, and you sure don't want to go bigger since you already are having mpg problem.
I have 18's in staGGERED and will go 5% smaller to get more acceleration when I change tires.
The only safety thing I see about run flat is you can get out of bad areas to deal with tire later. I would't run over 50 mph with compromised tire like that, and then 50 mile more when it deflates.
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