I don't think its too hard to figure out. Fill the overflow half way (if your ride has one) remove radiator cap. fill until almost full. Run it a couple minutes then check the level. No way you'll use a whole gallon jug I would think.
When I filled mine the first time before break in I kept the cap off to keep an eye on it while I ran it for 10 minutes. I don't think I even used a half a gallon.
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