JMG,
There have been several people who have added an extra gas tank to their Honda 2000 generators.
We get about eight to ten hours per tank when running in ECO mode on our Honda 2000. As nice as it would be to have the extra tank we've not really found a need for one. Your Yamaha should get about the same. They run a long time on a tank. We just carry a couple of little 2 gallon refill tanks and so far that has worked great.
But the extra tank setup is nice too. Have you tried a 'search' to see if you can find some of the previous discussions about this?
Good luck.
HamRad
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