wrote in message
...
Warning light comes on with an estimated distance of about 70 miles in my
car. Actual distance depends on driving style of course. The range will
drop slowly, end easily exceed the original estimate, until it gets to
about 20 miles at which point it drops rapidly

On my Peugeot 308, the warning comes on when the estimated range (from the
trip computer) changes drops below 100 miles. That's plenty of time to find
a garage.

On my wife's Honda CR-V, it's at about 30 miles estimated range, which is
cutting it a bit fine.

Mind you, I try to fill up before the level gets low enough to trigger the
warning, in case the myths are true about starting to suck up grot from the
bottom of the tank when the level gets low, and in case I'm a long way from
a garage when I start to run low.