[Dead Parrot]

In OK we don't have any vapor collection stuff on the gas nozzles so your results may vary.

Getting the truck nose down on a slope helps a lot. Doesn't have to be a steep slope. A few degrees helps.

Listen for the pitch/sound change that happens a few seconds before it is full. If your gauges are consistent, you should have a decent idea of how much gas each tank will need and be close when it should be nearing full. You have to be fast on the click off as that pipe/hose fills fast.

With the nose down a bit, I can often get a gallon or more of gas into the tank after the first click off if I slow fill it.