After 16000 miles of driving my TCH. I have come to the conclusion that there are two independent ways to improve mileage:

(1) Increase speed gradually till you reach a desired speed and try to maintain the needle at 40mpg (stay put at 40 mpg even if you lose some speed and on a down hill add some more pressure to return to prior speed).

(2)Drive to a "higher than desired speed" briskly and keep needle at about 40 - 50 mpg as speed gradually drops to desired speed. If speed falls below a desirable number, increase briskly again to about 15mph more and follow the procedure again.

I have done well over 70 miles per hour on a regular basis and always net 37 to 38 mpg on the dash (which is about 35 to 37 mpg in reality). My suggestion is to increase speed to a higher speed and then make sure the needle is stabilized at about 40 - 50mpg for long periods of time (at least 2 minutes at a time).