{
  "slug": "how-much-gas-will-my-trip-use",
  "title": "How Much Gas Will My Trip Use?",
  "heading": "How Much Gas Will My Trip Use?",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/how-much-gas-will-my-trip-use",
  "summary": "A 400-mile trip at 28 mpg and $3.50/gallon uses about 14.3 gallons and costs roughly $50.",
  "description": "Trip fuel usage and cost are calculated from distance divided by your vehicle's miles-per-gallon rating, then multiplied by the local gas price. This calculator gives gallons needed and total fuel cost for one-way or round trips.",
  "formula": "Gallons = Distance ÷ MPG. Cost = Gallons × Price per Gallon.",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=how-much-gas-will-my-trip-use",
  "inputs": [
    {
      "id": "distance",
      "label": "Trip distance (one-way)",
      "kind": "number",
      "hint": null,
      "default": 400,
      "unit": "mi",
      "min": 1,
      "max": null
    },
    {
      "id": "roundTrip",
      "label": "Trip type",
      "kind": "select",
      "hint": null,
      "default": "false",
      "options": [
        {
          "value": "false",
          "label": "One-way"
        },
        {
          "value": "true",
          "label": "Round trip"
        }
      ]
    },
    {
      "id": "mpg",
      "label": "Vehicle fuel economy",
      "kind": "number",
      "hint": null,
      "default": 28,
      "unit": "mpg",
      "min": 5,
      "max": 100
    },
    {
      "id": "gasPrice",
      "label": "Gas price",
      "kind": "number",
      "hint": null,
      "default": 3.5,
      "unit": "$/gal",
      "min": 1,
      "max": 8
    }
  ],
  "outputs": [
    {
      "id": "cost",
      "label": "Total fuel cost",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "gallons",
      "label": "Gallons needed",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "totalDistance",
      "label": "Total distance",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Trip distance (one-way): 400 mi",
      "Trip type: One-way",
      "Vehicle fuel economy: 28 mpg",
      "Gas price: 3.5 $/gal"
    ],
    "outputs": [
      "Total fuel cost: $50.00",
      "Gallons needed: 14.3",
      "Total distance: 400"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter trip distance (one-way) (mi).",
      "Enter trip type.",
      "Enter vehicle fuel economy (mpg).",
      "Enter gas price ($/gal).",
      "Read your total fuel cost on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "distance": 240,
        "roundTrip": "false",
        "mpg": 17,
        "gasPrice": 2.1
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "distance": 400,
        "roundTrip": "false",
        "mpg": 28,
        "gasPrice": 3.5
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "distance": 640,
        "roundTrip": "false",
        "mpg": 45,
        "gasPrice": 5.6000000000000005
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How much gas will my trip use?",
      "a": "A 400-mile one-way trip at 28 mpg uses about 14.3 gallons; at $3.50/gallon, that's roughly $50 in fuel cost — double both for a round trip."
    },
    {
      "q": "Does highway vs city driving change the mpg to use?",
      "a": "Yes — use your car's highway mpg rating for long road trips since highway driving is typically 15-25% more fuel-efficient than the combined or city rating."
    },
    {
      "q": "How does towing or cargo weight affect trip cost?",
      "a": "Towing a trailer or carrying heavy cargo can cut fuel economy by 20-40%, so if you're towing, use a reduced mpg estimate to avoid underbudgeting your trip fuel cost significantly."
    },
    {
      "q": "Should I add a buffer to the estimate?",
      "a": "Adding 10% covers detours, traffic idling, and AC use, which all reduce real-world mpg below the vehicle's rated average."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/how-much-to-charge-an-ev",
    "https://www.revenuelab.fyi/toolbox/how-much-will-my-electric-bill-be"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — How Much Gas Will My Trip Use? (https://www.revenuelab.fyi/toolbox/how-much-gas-will-my-trip-use)"
}