What is the optimal remaining fuel level before refueling a car?

[McAlivia]

It is most appropriate to refuel when the car has a quarter of its fuel remaining. Precautions for car refueling and fuel tank maintenance are as follows: Fuel tank maintenance: Drain accumulated water and sediment from the fuel tank, and check for oil leaks at pipe joints and switches. For fuel tank caps equipped with air valves and steam valves, also inspect whether the vent holes are clear. The filter screen at the fuel filler neck should remain intact to prevent impurities from entering the tank during refueling and clogging the fuel lines. The sealing gasket on the fuel filler cap should also be in good condition to prevent fuel from spilling out while driving. Precautions for car refueling: Refuel in the morning or evening to avoid direct sunlight at noon; add more fresh fuel before long-distance trips; do not exceed the fuel tank's maximum capacity; turn off the engine and power, and no smoking is allowed during refueling.

[StAva]

Having driven for over 20 years, I believe refueling when the tank is down to a quarter is most appropriate. Otherwise, the fuel pump may overheat and fail easily, as gasoline actually helps cool the pump. When the fuel level drops below a certain point, sediment may also be sucked into the engine, leading to various potential malfunctions. Every time my fuel gauge shows about a quarter left, I head straight to the gas station, especially during long trips or mountain drives, to avoid breaking down midway. This habit has saved me a lot on repair costs and reduced unexpected risks. I recommend paying more attention to the fuel gauge warning light—don’t wait until it lights up to act, as that’s bad for engine maintenance. Additionally, if you frequently use ethanol-blended gasoline, refuel even earlier, as it absorbs moisture more easily and deteriorates faster. Overall, maintaining an appropriate fuel level ensures smoother and safer driving.

[AniyahLynn]

I drive to work every day and find it quite good to refuel when there's one-eighth of the tank left. It saves both time and money, avoiding frequent trips to the gas station. Refueling too often actually wastes gasoline and time spent waiting in line. For my urban commute, I'm used to refueling when the tank is nearly empty, but of course, I never let it run completely dry—that could be troublesome if I get stuck in traffic or need to take a detour. This method helps me save on fuel costs and reduces the burden on my car. Personally, I believe it's important to adjust based on driving routes—for example, refueling a bit earlier on highways to avoid emergencies disrupting the trip. Paying attention to the fuel gauge and forming a habit makes it effortless over time. When the fuel level is low, the car might be lighter, but the engine could run less smoothly, affecting overall fuel efficiency. In short, finding the right balance that suits your daily routine is the best approach.

[DelMaria]

Drive safely and be cautious. I believe you should refuel when the tank is down to a quarter full. If the fuel level gets that low, encountering an emergency or traffic delay could easily leave you stranded on a remote road, making it a hassle to seek help. As someone who frequently drives on mountain roads, I make it a habit to keep ample fuel reserves to avoid the hassle of the low-fuel warning light coming on midway. This enhances driving reliability, especially in bad weather or during night driving. Maintaining an appropriate fuel level also reduces fuel evaporation and environmental pollution. Remember, carrying a spare fuel can is a wise move.