I'm remembering a friend of mine who was mowing lawn on a
rider. Said the tank on the mower was enough to do the lawn.
Except for the one day when the grass was higher, and he had
to gear down a bit. Ran out of gas on the far end of the
lawn, and had to come walking back for the gascan. I figure
it's easier to have a one galon "get home" tank onboard.

They used to make in the tank gas gages. Bit of a float, on
a spiral metal that turned the gage. Wonder if those are
still sold. Then, the OP could watch his gas level as he was
working.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
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Why not just make a roundtrip down the 600 ft driveway and
then check
how much fuel is left. That will give you an idea of when
to check it
again.