Bike specs for anyone interested.
my bike (red)
1973 tx650 motor, never opened. bigger carb jets for sea level performance, pamco elec ignition, HHB pma adapter, sparks capacitor, shindengen mosfet voltage regulator, ebay stator, 18/30 gearing 520 chain.
son's bike (blue)
1980 stock motor, stock charging system, points ignition, 18/32 gearing 520 chain.
We ran 80 mph on the highways, 55-65 mph on the 2 lane roads. I averaged 45 mpg fully loaded, my son did better with over 50 mpg.
The only hiccup on the trip was the points fouled on my son's bike. The previous owner reverted his 1980 electronic ignition bike back to points for some reason, so there is a pamco in his bike's future. had to limp 80 miles to get to a parts store, but we made it.