How Far Can You Really Drive Once The Fuel Light Comes On?
That little orange light. We have all seen it. We have all ignored it. And we have all played the dangerous game of WILL I MAKE IT TO THE NEXT SERVO
With fuel prices making us question whether we should start walking everywhere, it is tempting to squeeze every last kilometre out of the tank.
But how far can you actually drive once that fuel light comes on? And more importantly, is it doing your car any favours?
How much fuel is actually left?
Here is the thing: Your fuel light doesn’t mean you are completely empty. Most cars have a reserve amount of fuel remaining when the warning light appears. Depending on the vehicle, that might be around 5-10 litres, sometimes more or less.
But before you start celebrating your bonus kilometres, there is a catch.
How far that fuel will take you, depends on several things:
Your vehicle: a small hatchback and a thirsty V8 are two different stories
Your driving habits: Heavy acceleration burns through fuel faster
Traffic conditions: Stop- start traffic can make those remaining litres disappear surprisingly quickly
Road conditions: Hills, loads and towing can all increase consumption
Some vehicles might manage another 50 kilometres or more. Others won’t get nearly that far.
Is driving on empty actually bad for your car?
Short answer? It can be.
And no, that is not the mechanic trying to scare you into the workshop.
Your fuel pump isn’t a fan
In many modern vehicles, the fuel pump sits inside the fuel tank and relies on fuel for cooling and lubrication.
Regularly running the tank extremely low can increase the risk of overheating or premature wear, particularly if the pump starts drawing air.
And replacing a fuel pump isn’t exactly how anyone wants to spend their weekend.
2. Running out can cause bigger problems
When your tank gets critically low, your engine might start to hesitate, misfire or stall. On some diesel vehicles, running completely dry can also mean the fuel system needs to be primed before the engine will start again.
Not exactly ideal when you are stuck on the side of the Peninsula link.
3. The dirt at the bottom myth
You have probably heard that driving on empty sucks all the dirt from the bottom of your fuel tank .
The reality is a little different.
Most fuel pumps already draw fuel from near the bottom of the tank and modern vehicles have fuel filters designed to catch contaminants.
So running low doesn’t suddenly unleash years of hidden dirt.
However, consistently running extremely low still isn’t a great habit, particularly if your fuel system is already struggling.
What about that distance to empty reading
You know the one.
42 km remaining
You drive five kilometres
28 km remaining
EXCUSE ME ?!
Your car calculates its estimated remaining range using fuel level and consumption information. Change your driving conditions and that number can change quickly.
It is a helpful guide, but it is not something we would recommend testing to zero.
Our advice? Don’t play fuel roulette.
We understand. Fuel is not cheap and nobody enjoys watching the dollars climb at the bowser.
But there is a difference about getting the most out of your tank and pushing your luck.
A few simple habits can help:
Refuel before the tank gets critically low
Keep your tyres correctly inflated
Avoid unnecessary heavy acceleration
Stay on top of regular servicing
Investigate sudden changes in fuel consumption
If your vehicle has suddenly become thirstier than usual, it could be worth having it checked out.
The Bottom Line
Your fuel light is a warning, not a personal challenge!
Yes, you probably have a little fuel left . No that does not mean you should see how far you can oush it.
Because saving yourself one trip to the servo isn’t much of a win if you end up paying for a tow truck instead.
And if your car is using more fuel than it should, running rough or generally not behaving itself, the team at Garage 27 in Carrum Downs can help get to the bottom of it.