I never changed the rear sprocket. 42 teeth springs to mind.
Fuel consumption at 70 is going to be about 55 mpg. Your trouble will be the dead volume in the tank. The RH lobe isn't connected in so once you get the level below the frame you can either tip it on its side every few miles or push it. Reserve will be at 140 miles or so, pushing by 180. I'd try the reserve tap before you go if it isn't used that often, the o-rings can dry out and leak.
It'll be a good ride.
Andy
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