With gas prices fluctuating constantly, the cost of a fill-up varies a lot depending on your car and where you live. Here's a clear breakdown of what you can expect to pay in 2026.
The national average gas price in the US in 2026 is around $3.20–$3.60 per gallon for regular unleaded. Most passenger cars have tanks between 12 and 20 gallons, which puts a typical fill-up in the range of $40 to $70 from empty.
Most drivers don't fill up from completely empty. If your tank is half full, divide these numbers by two to get your real fill-up cost at the pump.
Tank size varies significantly by vehicle category. Here's what a full fill-up costs at $3.40/gallon:
| Vehicle Type | Typical Tank Size | Cost to Fill (@ $3.40/gal) |
|---|---|---|
| Compact car (e.g., Honda Civic) | 12–13 gal | $41–$44 |
| Midsize sedan (e.g., Toyota Camry) | 15–16 gal | $51–$54 |
| Midsize SUV (e.g., RAV4) | 14–16 gal | $48–$54 |
| Full-size SUV (e.g., Chevy Suburban) | 24–28 gal | $82–$95 |
| Pickup truck (e.g., F-150) | 23–26 gal | $78–$88 |
| Minivan (e.g., Odyssey) | 19–20 gal | $65–$68 |
Most cars run on regular 87 octane. If your car only recommends premium but doesn't require it, regular is fine — you'll see a minor efficiency difference but nothing significant. If your car requires premium (check your owner's manual or the fuel cap), don't skip it. Using regular in a car that requires premium can cause engine knock and long-term damage.
Premium gas typically costs $0.50–$0.80 more per gallon than regular, adding $10–$20 to a full tank.
Where you live matters a lot. California regularly sees gas prices $1.00–$1.50 above the national average due to state taxes and special fuel blends. States like Texas, Mississippi, and Oklahoma are typically among the cheapest. If you're near a state border, it can be worth crossing over to fill up.
The average American drives about 1,200 miles per month. If your car gets 28 MPG, that's roughly 43 gallons per month — around 2–3 fill-ups. At $3.40/gallon, that's about $146/month in gas for an average driver.
Enter your MPG and weekly mileage to see exactly what you're spending on gas.
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