Super singles can provide better fuel economy. On the other hand,If it blows and you don't have a tag, you'll be on the wheel $$,just like the front I would say that's not so good ! The cost to change over is great. ,Greater than any RV'er is gong to see in better fuel economy in the tiny amount of miles they drive compared a OTR truck. I drove for a major company and they still wont change over. They've run tons of tests, it still doesn't pencil out <$ If it did they'd be on it like ....