Word used to describe someone who has unrealistic ideas about how much remaining fuel their car / boat / barbecue has.
May also be used to describe someone who fills up their car at the exactly the most expensive point during a weekly price cycle or before busy public holidays.
Yuk... these sausages are still frozen in the middle
I know -- but they'd be fully cooked if your Dad wasn't so fuelhardy with the BBQ gas.
Damn... the prices have already gone up for the long-weekend. I could have filled up the car yesterday for $15 less!
Yes, but you were too fuelhardy.