Ditto what others have said...
Slow down is the biggest bang for the buck
Next is to super tune and maintain your setup, including airing up
the tires on both TV and TT
Sell your TV and Trailer for lower class TV, say a half ton with a tiny ICE for
the MPG. Smaller trailer and look for one with a better aero architecture...like an
Airstream
Some have found out the hard way that lower class, half ton, towing
the same trailer will get worse MPG, as the lower class truck/SUV
has to work much harder than the higher class TV did
Or just understand that is the price to pay to play...