160 mile round trip

I live in Decatur ,IL and I'am planning a 80 mile trip to my dads house. He lives in Hillsboro ,IL also to tag a long is my good buddy Hookwormrider1. were going to take the scenic route as much as possible to stay off the main roads. in a car its about a hour and a half. I figure its going to take between 3 and 4 hours to get there on our rides. were going to take our time ride no faster than 25-28 mph and give our motors plenty of breaks along the way.
I fitted my bike with saddle bags to haul tools and a spare tube and a gallon gas can and a tow rope if needed also some rain gear just in case. its actually a 72.9 mile ride , so I'am hoping I can make this trip on a single tank full. I have a 36 tooth sprocket on the rear to help with the mileage. does anyone have any thoughts on a 80 mile trip and has anyone done a longer trip ? your thoughts and or suggestions would be helpful! were plaaning this trip the first weekend of Oct.

the day is coming for my 80 mile trip. this saturday Oct. 4th . hitting the road at 8:00am and will be riding a good 4-5 hrs. arriving at my destination around 1:00 pm.
Hookwormrider1 and I will be heading out , so wish us a safe journey!

thanks for the wisdom. I do have a spare tube, extra link, zipties, a gallon of fuel, some basic tools to get a job done, rain gear (just in case), GPS, oh yeah and a air pump , and still enough room in the saddle bags for any thing else. if you think I have forgotten anything , please remind me!