^This.
I like to have a full tank of fuel when I commute to the office. It doesn’t matter if I’m at a quarter tank, a half tank, or three quarters of a tank. If I’m driving 250 miles in a day, I refuel.
When I’m not commuting, then between a quarter tank and just before the low fuel light/alarm comes on.
I always fill up. It depends - staying local - < 1/8.
Road trips to rural areas (about ½ dozen/yr) - I’m looking by 3/8th & almost hyperventilating at ¼.
Early morning long trip - fill up the night before (Sat we were out by 5am; 127 miles, back home by noon)
The exception is if I’m going on a long ride past the super cheap gas in a neighboring state, I may top off my tank locally early in the week when I don’t really need it so I can get there on low later in the week & save 40+¢/gal
I almost replied that I let the chauffeur handle it, but that’s not exactly true. We have two cars between three people in our household, and the one we all like best is a plug-in hybrid, so it’s pretty rare that we need gasoline. When we do, I’m the one with the highest tolerance for a fairly low gas level, so it’s almost always possible for me to leave it for the next driver.
Good thing no one with “fuel anxiety” was with me one day when I drove to an area of downtown where gas stations were few and far between, and by the time I got off the highway the fuel warning light had been on for quite some time. There was a gas station right there but the price pissed me off, so I rather foolishly decided to take the risk and go a few miles up the road where I was going anyway, and where I remembered there was another one, figuring I’d probably just barely make it and arrive on fumes. So I got there and the station had closed! So I had to double back, at this point now really seriously worried, to the point I was turning the engine off at stop lights. Somehow I made it. From the amount of gas I put in, the tank was indeed very nearly empty.
Had you been with my wife on that trip I doubt you would have made the same decision 
It’s really not worth the hassle.
Driving locally somewhere between 1/8th tank and when the warning comes on. For a long trip I fill up beforehand, the motorways / interstate are a little different here in the UK than the US. As a junction there is often nothing except a road leading to the town a few miles a way and maybe a couple of more minor through roads. If you want fuel in the middle of a long journey you have to a) buy it ar a “service station” (a rest area with restaurant(s), a shop and fuel all at greatly inflated prices (gas might be an extra $2 a gallon)) b) know which junctions have fuel close by at a reasonable price or c) cme off the motorway and wander on the monor roads looking for a station.
I’ve never had a problemdue ot letting the fuel get low but the other side of the argument is having your fuel tank full all the time increases consumption due to the extra weight. In order to meet governmet requirements on fuel efficiency here nearly every manufactirer has made a spare tyre an optional extra. (The fact that the can charge extra for it is a bonus)
I always have the best of intentions to fill up as soon as it dips below half. Because who knows when a carful of bad guys will start pursuing me on a five-state car chase? (Probably a case of mistaken identity, but if they think I’m the guy they’re looking for, I have to act accordingly. Bad guys may not be inclined to stand around and listen to explanations.) I’ll want to be as full as possible when something like that starts.
But in reality, I usually end up stopping for gas somewhere just above or below a quarter.
Same (except only 20-some years, not 60). Never worried about running close to empty on my Saturns (165K miles and 120K miles) and never had any fuel pump trouble or ran out of gas. After those, in a GTI, on many occasions over 10 years I put over 15 gallons in an ostensibly “14.5 gallon” tank - once 15.6 gallons! No issues in 110K miles with that. I’m sure I was very close to “running on fumes” but I always successfully drove up to a gas pump.
Nowadays I plug the EV in every night.
You’d think that would be an option on this sort of poll.
Personally, I fuel up whenever I eat.
I picked quarter tank but it’s really between 1/4 and when the light comes on. I barely drive since I’m working from home and, once it gets low enough, I’ll fill it up during my weekly Costco visit. I don’t start gauging how busy the Costco fuel pumps are against my willingness to wait until it hits a quarter but it might be another week or two before I suck it up and get in line.
This describes me. I have a long commute, putting about 350 miles a week on my car just going to work and back. 350 miles is about what one full tank can handle so I usually end up fuelling up when I have about 40 miles of range left.
However, a significant part of my commute is rural mountain roads so if I have, say, 60 miles left in my tank but I still have to make the full trip to work and back, I know I won’t have enough for the commute thus I’ll fill it up at the 60 mile mark, or whenever I know I’ll need to fill it to make the round trip without worry.
In the winter I usually fill up when I have ~100 miles of range left, for reasons I can’t really explain – just an old habit I guess. And any time I’m taking a long-ish trip I make sure the tank is filled the night before I leave.
Whenever the fuel light comes on, usually. If leaving on an extended drive, I fuel up before leaving and at every stop on the way to my destination.
That’s a good point! I charge the car at night if it has under 3/4 charge. If I know the next trip will be across town or farther, I’ll charge it to full no matter what.
Once there are more charging stations in New Mexico, I anticipate that we’ll charge it while we eat as well.
I don’t charge while I eat. I drive a Flintstone car. It takes a lot of feet moving to get that thing going. Now if you’ll excuse me, there’s a brontoburger waiting for me.
Years ago, I had a car on which the fuel gauge didn’t work. It wasn’t worth what it would cost to get it working again, so I learned to use the trip odometer as a fuel gauge.
I still do, though now I drive a car that has a working fuel gauge. I can go 500-600 km (~300-350 miles) on a tank, though I usually play it safe and fill up at ~450 km (280 miles), which, according to the fuel gauge, is a quarter-tank or so.
I ticked the “low fuel light” answer as this is my usual practice, but there is a major semi-regular exception.
Gasoline is much cheaper in my country than in neighboring countries. In fact, we have a couple of border streets where our side is all petrol stations, a row of half a dozen different operators, to serve the demand from visiting drivers.
So if I’m leaving the country on a long drive, I will stop and fill the tank before I cross the border, even if it’s already mostly full, to minimize the fueling I need to do in other countries.
Isn’t it cooled by the fuel passing through it, not what’s outside it?
Yeah, like I care about you fancy plug-in driving people! 
OK, I was just thinking about gas/diesel vehicles when I created this thread. I have no personal frame of reference for EVs or hybrids. And mostly it was inspired by my spousal unit who seems oblivious of his fuel state most of the time, till it’s OMG, I need gas!!! It got me to wondering how typical he is. I’m usually looking in the 1/4-1/2 tank range for local driving. On road trips, I try not to get below 1/4 but I don’t get antsy till it’s below 1/8.
I chose “When the fuel light comes on” in the poll (which on my car is when the trip computer estimates about 30 miles of range), but really it’s “as close as I can get to 0 and a bit past, provided my wife isn’t there or doesn’t notice”. I always thought the low fuel = potential damage was a myth in modern cars, but this thread prompted me to research the issue, and a few sites suggested it could in fact contribute to the fuel pump overheating and/or the fuel filter getting clogged, so I’ll probably push it less far in future as a result.
Still, I think people who always fill up when down to half a tank (absent some good reason, like many of those mentioned in this thread) are visiting the station twice as many times as they need to.
On the other hand, if you’re stopping at the convenience store anyway for a beverage or a snack, why not just top off the car too? And I don’t think it takes more than 5 minutes at the most for a fill-up in my Sonata. The peace of mind of not running on fumes is worth the extra minutes to me.