You normally don't use the public ways box. You should enter zero,
Say you buy 200 gallons of gas in your farm tank and you have a receipt for that. Gas you used off public ways (like on the farm) is untaxed and gas you used on the public ways (roads) is taxed. But for boaters, all the gas on the receipt should go in the boat and be untaxed.
Total all you receipts on the back in line 17, and copy in line 20. Line 19 is for International Fuel Tax, I'm guessing for truckers, I always leave it blank.
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