The gas tank in your 2003 Honda Civic strictly holds 13.2 gallons—unless you’re one of the few owners with a GX model, which takes only eight gallons, due to having a standard CNG fuel tank.
Not knowing the fuel tank capacity on your vehicle may not seem like all that big of a deal—until it comes time to fill up your tank, do your own maintenance or repairs, or your trivia team is counting on you for the right answer.
No matter your situation,
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How big is the gas tank on a 2003 Honda Civic?
The gas tank on a 2003 Honda Civic is the same across all its models—except the GX, a CNG (compressed natural gas) vehicle produced from 1998 through 2015.
While it’s much more likely you own a regular gasoline-powered Civic, we will still go over all the possible tank sizes so no one feels left out.
Here are the possible configurations, trims, and respective engine types for a 2003 Honda Civic:
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All models from the DX through the Hybrid model have a fuel tank capacity of 13.2 gallons (50 liters). The GX, however, has a much smaller gas tank that can accommodate up to 8 gallons (31 liters).
The GX has a special fuel tank that can store the compressed gas under extreme pressure, as well as a fuel regulator. But while the gas tank has a smaller volume, these parts surprisingly take up more space than a conventional gasoline tank—which explains why the GX has only 7 cubic feet of trunk space as compared to 12.9 cubic feet for the rest of the lineup.
How to check your 2003 Honda Civic’s gas tank size
Don’t just take it from us! There are a few ways to check your 2003 Honda Civic’s gas tank size so you never have to worry about running low or running into other unforeseen issues.
Check your owner’s manual
The best, albeit perhaps the most obvious method, for verifying the size of your Civic’s gas tank is by checking the specifications in your owner’s manual. Look for keywords like “fuel tank capacity.”
If you’ve thrown out your manual or otherwise lost it, you’re in luck—Honda has most of its specifications uploaded to its website. You can look up all the
2003 GX specs and other vehicle information in the
Honda Civic Owner's Manual.
Drive till empty, then fill it up
If you’re feeling a little more adventurous, you can drive until your fuel gauge hits “E”, then see how much gas it takes on a fill-up. This method works best on regular gasoline vehicles, but be sure not to drive too long on empty to avoid damage to your car.
We do not recommend testing the limits of your GX, however. Overfilling, or even filling your tank up to the brim is not recommended. Underfilling can also cause unnecessary stress on your system. Besides, considering only 1% of gas stations offer CNG, you’ll want to make sure you give yourself ample time to make it to the pump before you run out.
How to save on fuel costs in a Honda Civic
CNG is pretty cheap, but it isn’t necessarily always cheaper than gasoline. Nevertheless, it’s a pretty economical and environmentally friendly fuel option, generally speaking. Gasoline, on the other hand, is incredibly expensive.
Neither configuration has an abysmal fuel economy, but there are always ways you can improve it and save money while you’re at it. Here are a few tips to follow:
Schedule regular service. Skipping maintenance appointments can cause wear and tear on your Civic that can hamper its efficiency, which will cause it to run through more fuel more quickly.
Let up on the pedals. Harsh braking and acceleration will quickly tank your fuel efficiency.
Don’t idle. Many people believe it necessary to let their cars needlessly run in place for them to efficiently warm up—this is a myth and wastes precious fuel. You should instead
ease into driving on cold winter days.
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