Yamaha 1300 Tourer - Yamaha 1300 Tourer Fansite

My gas mileage when riding on the interstate is terrible. My average speed is 79 to 83 mph. At these speeds I get as low as 36mph and my high mpg is 40 mpg. When riding around town and all day back road rides I get 44- 51 mpg. I have Road House Slip- Ons, FI2000R, and a Thunder Air KIt. Should I adjust the FI2000R for Interstate? If so, what would be a good starting point. My FI2000R has never been changed from the preset settings from the factory. I hope everyone is having a wonderful summer. Ride safe ya'll!
Peace,
Chuck